In a circular race of 840 m, A and B start running in the same direction at the same time from the same point at the speeds of 6 m/s and 12 m/s, respectively. After how much time will they meet next?

Options
a) 140 s
b) 70 s
c) 20 s
d) 40 s

Solution

As per question
Circular race of A and B = 840 m
A’s speeds = 6 m/s
B’s speeds = 12 m/s
Relative speed when running in the same direction = A – B = 6 – 12 = 6
Meeting time = distance/speed
Meeting time = 840/6 = 140 s

Ans: 140 s