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Time and Work (in Hindi)
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This lesson deals with the questions related to Time and Work.

Chetan Mna is teaching live on Unacademy Plus

Chetan Mna
NITian , 4 year Teaching Experience , working with Indian Railways , cleared SSC ,SSE,CHSL, IBPS etc

U
Unacademy user
notes ezhthunnund....ipo kurach time athinu vendi spend cheythal revision time easy akum
please help me with Q1,4 and 6
Reeti Mittal
2 years ago
Q1 and 6.... query resolved.... now i have doubt in Q4 only... please someone help me with this
Reeti Mittal
2 years ago
Q1 and 6.... query resolved.... now i have doubt in Q4 only... please someone help me with this
Akash Chaudhary
2 years ago
let b does x amount of work a day so but a does half of work done by b in 1/6 of time (1/6 of day in simple).therefore x/2=1/6 now we need to make one on rhs because we need find the amount of work dome by a in a a day so multiply both side by 6 we get work done by a =3x so work done by b in a day = x work done by a in a day = 3x total work done in a day =4x 4x * 10 =1 x=1/40 so b does 1/40 part of work a day so to complete work b will take 40 days
Reeti Mittal
2 years ago
Thanku ????
Roshan jahan
2 years ago
Thanku #Akash ji
Vogeshkumar yadu
2 years ago
reeti mittal , please tell me ques. 6 .
Pritanka Kumari
a year ago
i din dnt have any idea about quadratic equation and simple eqation what type of question may be asked in cat exam .please guide me .
you are doing a tremendous job!!!!! student will have hell lot of help from these courses..Thank u soooooo muchhhhhh
Abhishek Shah
2 years ago
I agree
V
Varun
a year ago
nisha I think pratiyogita mantra is best. finally chetan sir has not clear any exam at selection level yet...still going on...god bless u
Can anyone give solution of question 1, 4, 12
Namrata Bajpai
2 years ago
Q1. REMAINING WORK =1-7/8=3/10 NOW A+B=3/10 OF WORK IN 4 DAYS A=B=4/3/10=4X10/3=13/3
First of all thankyou! How you have wrote 4/3/10? They are working 3/10 in 4 days ie., 3/10/4 =12/10 is there one day's work? Please clear it.
Namrata Bajpai
2 years ago
its A+B=4/3/10=4X10/3 =40/3 AND(4 is the day and 3/10 is work)
Ok thank you.
Ok thank you.
Ok thank you.
Namrata Bajpai
2 years ago
its A+B=40/3
Ok.
Q 4) Suppose B takes x days to do the work. As per question A will take 2∗(1/6)∗x=1/3xdays (A+B)s 1 days work= 1/10 1/x + 3/1x = 1/10 or x = 40 days
A
how b=100 in last question which you taught sir?I didn't get it.
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
as a complete 7/10 unit per day similarly b complete.3/10 unit per day ...hence 30/(3/10)...it will be 100 days
Jemi Godhani
2 years ago
1 day work of A is 7/10 and 1 day work of B is 3/10... then time by A = 30/(7/10) =300/7 that also time by B = 30/(3/10) = 100
Can someone please help me with Q11.? Thank you
Vishwas Bhardwaj
2 years ago
simply use Men x days x hours / work formula..
Vishwas Bhardwaj
2 years ago
72x21/280 = Mx18/100
Thank you.
Balbir Kumar
2 years ago
good
  1. CRASH COURSE QUANTITATIVE APTITUDE ARITHMETIC) PRESENTED BY CHETAN


  2. TIME AND WORK


  3. ABOUT ME Mechanical Engineering. (NIT SURAT) Cleared SSC CGL main 2016, GATE 2015 Cleared Various Written Exams: CHSL Pre 2016 (146.5), IBPS PO 2015 (intervie SBI PO MAINS (2015), RRB MAINS 90+, SSC JEN.,DMRC, Sse. secunderabad (2015 Follow me on Unacademy at Course fee Contribute(OPTIONAL) If u like my course-please Rate,Review, Recomend https://unacademy.com/user/DAMON SO5


  4. Q1. A completes7/10ofa work in 1 5 days. He completes the remaining work with the help of B in 4 days. The time required for A and B together to complete the entire work is: Q2. A man, a woman and a boy can together complete a piece of work in 3 days. If a man alone can do it in 6 days and a boy alone can do it in 18 days, how long will a woman alone take to complete the work? Q3. A and B can do a piece of work in 10 days, B and C in 15 days and A and C in 20 days. C alone can do the work in: Q4. A does half as much work as B in 1/6 of the time. If together they take 10 days to complete a work, how many days shall B take to do it alone? Q5. A can do a piece of work in 4 hours, B and C can do it in 3 hours; A and C can do it in 2 hours. How long will B alone take to do it? Q6. A does 4/5 of a piece of work in 20 days; he then calls in B and they finish the remaining work in 3 days. How long will B alone take to do the whole work? Q7. A can finish a work in 18 days and B can do the same work in half the time taken by A. Then, working together what part of the same work can they finish in a day?


  5. Q8. A and B can finish a piece(f 30 days, B and C can finish it in 15 days while C and A can finish it in 10 days. Time taken by them together to do this work is Q9. A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in: Q10. A and B can together finish a work in 30 days. They worked together for 20 days and then B left. After another 20 days A finished the remaining work. In how many days can A alone finish the job? Q11. If 72 men can build a wall 280m long in 21 days, how many men will take 18 days to build a similar type of wall of length 100 m? Q12. Babu and Asha can do a job together in 7 days. Asha is 7/4 times as efficient as Babu. The same job can be done by Asha alone in: Q13. If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it? Q14. A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work is done by A in: Q15. If 6 persons working 8 hours a day earn Rs. 8400 per week, then 9 persons working 6 hours a day will earn per week: Answer (140/3 days (2) 9 days (3) 120days (4) 40 days (5) 12days (6) 37.5 day (7) 1/6 day (8) 10 day (9)6 day (10)60 days (11) 30 men (12) 11 days (13) 12 days (14) 10 days (15) 94


  6. -1 At BtC (l ol..D) = 1.3 2 2 ays e 2 12 13 C- ) 20 -340 days


  7. s and he remaining osK Cem plelea ma au 48 sdays 4824 das 6 4811 48 dag, S.


  8. (vo) lete half as much a much oar as as much work as A B 4ogeherc , alon e o rma 2 7. -t


  9. a n 83 .krs-bbese tolalu orK, B 3 _-* At 8) t 10 (A)-= time taken by A total work/ 1 day work ) { 30/ (7/10) } 300 /7 days TIME taken by B = 100 days


  10. a lone wou dn ROD many days alme lon cloth . Hexe , more 4ha A+ 0