Question

A, b, c are running clock wise around a circular track and their time periods to run a circle are 1min, 3min and 5min respectively. find the time interval after which they meet for the first time at the starting point. (a) 9 min (b) 20 min (c) 10 min (d) 12 min (e) 15 min

Answer 1

option e that is 15 mins is the correct answer

Answer 2

Answer: (e) 15 min

Step-by-step explanation:

Given : A, b, c are running clock wise around a circular track and their time periods to run a circle are 1min, 3min and 5min respectively.

Then the time interval after which they meet for the first time at the starting point = Least common multiple of 1, 3, 5 = 15

Thus, the  time interval after which they meet for the first time at the starting point = 15 minutes.

Hence, (e) is the correct option.