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TSD Circular track problem - 1
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TSD circular track problem part - 1

Bharat Gupta is teaching live on Unacademy Plus

Bharat Gupta
Engineer by degree Mathematician by Heart. Having 22 years of teaching experience. Visit my youtube channel BHARAT GUPTA-RADIX .

U
Unacademy user
sir last slide me circular pitch kese decrease hua samajh me nhi aaya😥😭
bhai Pc= (pie * d)/T ...so by incresing the no of teeth the Pc decreased
Gulshan Reddy
a year ago
hmm usi din doo bar lecture dekh ne se samajh aa gya but comment delete kar ne ka koi option nahi hai unacademy me by the way thank you
Last question A and B are travelling in the same direction, how can they meet in 12 hours.
Sir in the first question we are dividing 1000m by 5 minutes and writting the ans as 200 meters/seconds. Should we not convert the time into seconds.
sir, you have done the first question wrong because According to question it says "they reach the same point" that means they are reaching at starting point for which calculation will be different
sir in the last question, B is covering 96km or 4 full round of the track, and whenever A and C meets, A cover 9.6km so the number of meet should be (96/9.6 = 10) , sir i am getting 10 even after using your distinct point rule, in 2 round A and C meets at 5 distinct point, so in 4 round, they will meet 10 times.
sir in the last question if I take the ratio of the speed of A:C as 2:3 ie simplified the answer is different, why is this so?
Shrabanti Roy
7 months ago
yeah, the answer is 4. I'm also doing it in that way because in one of previous lesson there was a question like this but it was in the same direction but here c is coimg from the opposite direction. so here we need to add the ratio of speed and the ratio of speed for AB is 1 because (6:8=3:4=4-3=1) for AC it's 5 because(6:9=2:3=3+2=5), for BC it's 17 cause (8+9) so here a and b's district point is the starting point and a and c's meeting are other 3point and 2starting point
VP
Vaibhav Patil
6 months ago
Ratio of the speeds of the bodies are to be taken in consideration when we have to find out the number of distinct meeting points.
SONGS
3 months ago
through that condition you will get distinct point for meeting which will be 1. means they will meet 7 times at Only that single distinct point.
SONGS
3 months ago
through that condition you will get distinct point for meeting which will be 1. means they will meet 7 times at Only that single distinct point.
  1. TIME, SPEED AND DISTANCE Circular Track-3 Problems


  2. In 4000 meter race around a circular track of 1000 meters, the fastest and the slowest reach the same point at the end of 5th minute, for the first time after the start of the race. If the fastest runner runs at twice the speed of the slower, what is the time taken by the slower to complete the race? a. 5 min b. 10 min c. 20 min d. 12.5 min A can complete one full round around a circular track in 9 min and B in 15 min. If both A and B start simultaneously from the same starting point in opposite direction then how many times would they meet when B has completed 12 rounds? a. 28 b. 27 c. 23 d. 24 A and B are running on a circular track of length 300m. Race is of 4.5 km and speed of A and B are in the ratio 5 :3. How many times and when would the winner pass the other? a. 8 b.7 c. 6 d.4 A, B and C move along a circular track of length 24 km with speed of 6 km/hr, 8 km/hr and 9 km/hr respectively. A and B move in the same direction but C moves in opposite direction. If they all started at the same time and from same point, how many times A and C meet on the path by the time A and B meet for the first time on the track?


  3. In 4000 meter race around a circular track of 1000 meters, the fastest and the slowest reach the same point at the end of 5th minute, for the first time after the start of the race. If the fastest runner runs at twice the speed of the slower, what is the time taken by the slower to complete the race? a.5min b. 10 min c. 20 min d.12.5 min


  4. In 4000 meter race around a circular track of 1000 meters, the fastest and the slowest reach the same point at the end of 5th minute, for the first time after the start of the race. If the fastest runner runs at twice the speed of the slower, what is the time taken by the slower to complete the race? a.5min b. 10 min c. 20 min d.12.5 min 2 ne 2n-n lowo m ran


  5. A can complete one full round around a circular track in 9 min and B in 15 min. If both A and B start simultaneously from the same starting point in opposite direction then how many times would they meet when B has completed 12 rounds? a. 28 b, 27 c. 23 d. 24


  6. A can complete one full round around a circular track in 9 min and B in 15 min. If both A and B start simultaneously from the same starting point in opposite direction then how many times would they meet when B has completed 12 rounds? a. 28 b, 27 c. 23 d.24 Tolal am IS Cal is 9 IS No.


  7. A and B are running on a circular track of length 300m. Race is of 4.5 km and speed of A and B are in the ratio 5: 3. How many times and when would the winner pass the other? a. 8 b. 7c. 6d. 4


  8. A and B are running on a circular track of length 300m. Race is of 4.5 km and speed of A and B are in the ratio 5: 3. How many times and when would the winner pass the other? a. 8 b. 7c. 6d. 4 Rcho d .ud = s..>,Hu ywedd mu, at adah.auh sr.se s. : 3, No


  9. A, B and C move along a circular track of length 24 km with speed of 6 km/hr, 8 km/hr and 9 km/hr respectively. A and B move in the same direction but C moves in opposite direction. If they all started at the same time and from same point, how many times A and C meet on the path by the time A and B meet for the first time on the track? a. 8 b. 7 C. 6 d. 4


  10. A, B and C move along a circular track of length 24 km with speed of 6 km/hr, 8 km/hr and 9 km/hr respectively. A and B move in the same direction but C moves in opposite direction. If they all started at the same time and from same point, how many times A and C meet on the path by the time A and B meet for the first time on the track? a. 8 b. 7 C. 6 d. 4 2. 0 IS 1 2 ist IS