A and B started running simultaneously around a circular track from the same point in opposite direction. A and B take 28 mins and 35 mins to complete one round. After what time (approximately) will they be diametrically opposite to each other for the first time?
Explanation:
Let the length of the track be LCM (28, 35) = 140 meters.
⇒ Speed of A = 140/28 = 5 m/sec ⇒ Speed of B = 140/34 = 4 m/sec
Relative speed of A and B = 5 – 4 = 1 meter/min
Time taken to cover half the track = 701 min = 70 minutes.
Hence, option (b).
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