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TSD Circular track problem - 2
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TSD Circular track problem - 2

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 .
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Om Jaiswal
a year ago
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In the formula 1+nk, k is the number of distinct meeting points possible, n is just any natural number. Since nk must be 10 for the 1st and 11th meeting point to coincide, we say k must be a factor of 10. So, K can be 1,2,5 or 10. But only one distinct meeting point (k=1) isn't possible as min distance must be 300m. So, we check possible values of R for the remaining cases. Within each case, we have to ensure that 300m is less than or equal to half of R. Otherwise, the min distance won't be 300m anymore. Let's say 3R/5 = 300, it means R=500. So the meeting point which is at 300 m away in clockwise direction, will only be 200m away in anticlock wise direction. So, 300 more than half of R is not possible.
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sir, In first question how can you say there will be 3 distinct point. you did wrong.
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last question is not easy
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sir, why did we can 2r/5 and 3r/5 since they are racing on a track, they must be running in the same direction and hence, they will first meet at r/5 or r/10 or r/3 and can also directly meet for the first time at the starting point. These should ideally be the four cases taken. Isn't it?
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Vinushka Goyal
4 months ago
take*
all re not clear about last question concept is so clear and options also quite easy so if we go through option method it takes only 20 second to answer
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  1. TIME, SPEED AND DISTANCE Circular Track-3 Problems


  2. P and Q run in opposite directions on a circle. P runs in clockwise direction. P meets Q first time at a point 800 m in clockwise direction. P meets Q again at a point 600 m away in counter clockwise direction from starting point. If Q yet to complete one round. Find the length of the track. a.1000 m b. 1200 m c. 1100 m d. 1500 m Nakul can run around a circular track in 6 minutes, Sahdev can do the same in 11 minutes. If they start running together from the same starting point in the same direction, when will they meet for the first time at the point diametrically opposite to the starting point? a. 33 mirn b. 5 min c. 66 min d. Never meet at opposite point Two people are racing on a circular track and first meeting point and 11th meeting point are same. Minimum distance between starting point and first meeting point is 300 m. Find number of distinct track length possible. a. 3 b. 2 d. 6


  3. P and Q run in opposite directions on a circle. P runs in clockwise direction. P meets Q first time at a point 800 m in clockwise direction. P meets Q again at a point 600 m away in counter clockwise direction from starting point. If Q yet to complete one round. Find the length of the track. a. 1000 m b. 1200 mm c. 1100 m d. 1500 m


  4. P and Q run in opposite directions on a circle. P runs in clockwise direction. P meets Q first time at a point 800 m in clockwise direction. P meets Q again at a point 600 m away in counter clockwise direction from starting point. If Q yet to complete one round. Find the length of the track. a. 1000 m b. 1200 mm c. 1100 m d. 1500 m 9a0


  5. P and Q run in opposite directions on a circle. P runs in clockwise direction. P meets Q first time at a point 800 m in clockwise direction. P meets Q again at a point 600 m away in counter clockwise direction from starting point. If Q yet to complete one round. Find the length of the track. a. 1000 m b. 1200 mm c. 1100 m d. 1500 m 2


  6. Nakul can run around a circular track in 6 minutes, Sahdev can do the same in 11 minutes. If they start running together from the same starting point in the same direction, when will they meet for the first time at the point diametrically opposite to the starting point? a. 33 min c. 66 min d. Never meet at opposite point b. 5 min


  7. Nakul can run around a circular track in 6 minutes, Sahdev can do the same in 11 minutes. If they start running together from the same starting point in the same direction, when will they meet for the first time at the point diametrically opposite to the starting point? a. 33 min c. 66 min d. Never meet at opposite point b. 5 min


  8. Two people are racing on a circular track and first meeting point and 11th meeting point are same. Minimum distance between starting point and first meeting point is 300 m. Find number of distinct track length possible. a. 3 b. 2 c. 4 d. 6


  9. Two people are racing on a circular track and first meeting point and 11th meeting point are same. Minimum distance between starting point and first meeting point is 300 m. Find number of distinct track length possible. a. 3 b. 2 c. 4 d. 6


  10. Two people are racing on a circular track and first meeting point and 11th meeting point are same. Minimum distance between starting point and first meeting point is 300 m. Find number of distinct track length possible. a. 3 b. 5 c. 4 d. 6 3 2 R