In a 1200 m circular race, A and B start at the same time from the same position in the same direction at speeds of 18 km/h and 27 km/h, respectively. In how much time after the start of race will they meet for the first time on the track?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 480 seconds
Length of race = 1200 m
Speed of A = 18 km/h
Speed of B = 27 km/h
Speed of both in same direction = S(B) - S(A) = 27 - 18 = 9 km/h = 9(5/18) = 2.5 m/s
Time taken by them to meet for the first time on the track while running in the same direction = Length of the track/Speed in the same direction = 1200/2.5 = 480 seconds