Practice mode Races and Games

On a circular track, A completes a lap in 40 seconds and B in 60 seconds. Starting together and running in the same direction, after how many seconds will A first overtake B?

Correct answer C. 120 seconds

Explanation

A gains 1/40 − 1/60 = 1/120 of a lap per second, so A gains a full lap in 120 seconds.

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