Three men A, B and C go around a circle, 3520 metres in circumference, at the speeds of 320, 240 and 210 metres per minute, respectively. If they all start together, after what time will they meet again?
Explanation:
A and B move at a relative speed of (320 - 240) = 80 m/min. A and B come together in 3520/80 = 44 min.
A and C move together at a relative speed of (320 - 210) = 110 m/min. A and C come together in 3520/110 = 32 min.
A, B and C come together in 352 min (LCM of 44 and 32), i.e., A, B and C come together in 5 hrs 52 mins.
Hence, option (b).
» Your doubt will be displayed only after approval.
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.