A and B start cycling on a circular race track of length 3200 m from the same point, at the same time, in the same direction. Their speeds are 33 km/h and 42 km/h respectively. After how much time will they meet for the first time on the track?

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Answer & Explanation

Correct AnswerC. 21 minutes 20 seconds

Quick Explanation

Relative speed = 42 - 33 = 9 km/h. Track length = 3.2 km. Time = 3.2/9 hour = 21 minutes 20 seconds.

Time = track length / relative speed

Relative speed = 42 - 33 = 9 km/h. Track length = 3.2 km. Time = 3.2/9 hour = 21 minutes 20 seconds.

Use the standard formula directly after identifying the quantities.

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