Question

wilson mathan and guna can complete one round of a circular track in 10,15,20 minutes .if they start together at 7 am from the starting point at what time they will meet together at starting point?​

Answer 1

Answer:

All 3 of them will meet together at 8:00 a.m. at the starting point.

Step-by-step explanation:

Time taken by Wilson for completing 1 round of the track = 10 minutes

Time taken by Mathan for completing 1 round of the track = 15 minutes

Time taken by Guna for completing 1 round of the track = 20 minutes

The time when Wilson, Mathan & Guna will meet together at the starting point is calculated by taking the L.C.M of their time, so,  

L.C.M. of (10, 15, 20) = 5 * 2 * 3 * 2 = 60 minutes = [60/60] hrs = 1 hr.

Since we are given that they start together from the starting point at 7 a.m.

∴ The time when they will meet together at the starting point

= 7:00 + 1 hr

= 8:00 a.m.