On a 400 m track, Pawan and Qasim start together running the same way at 7 m/s and 5 m/s. 100 seconds later Rohan sets off from the same start, same direction, at 9 m/s. How long after his start does Rohan first overtake Pawan?

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Accepted Answer

150 s. After 100 s Pawan has run 700 m, so he is 300 m along the lap ahead of Rohan. Rohan gains 9-7=2 m/s: 150 s. (25 s is when he overtakes Qasim, who is only 100 m ahead.)

On a 400 m track, Pawan and Qasim start together running the same way at 7 m/s and 5 m/s. 100 seconds later Rohan sets off from the same start, same direction, at 9 m/s. How long after his start does Rohan first overtake Pawan?

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