Starting from the same point of an 800 m track, Dinesh and Ehsaan run in opposite directions at 7 m/s and 9 m/s. After how many seconds do they first meet?

Question

Accepted Answer

50 s. Closing speed =7+9=16 m/s; one lap of 800 m takes 800/16=50 s. (400 s uses the difference, 2 m/s.)

Starting from the same point of an 800 m track, Dinesh and Ehsaan run in opposite directions at 7 m/s and 9 m/s. After how many seconds do they first meet?

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