In a circular race of 1500 m, P and Q start from the same point and at the same time, at speeds of 20 km/h and 35 km/h, respectively. After what time will they meet for the first time on the track if they are running in the same direction?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 360 sec.
The speed of P = 20 km/h
The speed of Q = 35 km/h
The relative speed of P and Q = (35 - 20) km/h
= 15 km/h
= [15 × (5/18)] m/s = 25/6 m/s
The length of the track = 1500 m
Time required = Distance/Speed = 1500/(25/6) sec = 360 sec
Therefore, they will meet for the first time on the track in 360 seconds.