Question

In a circular race of 4225 m, X and Y start from the same point and at the same time at speeds of 54 km/h and 63 km/h. When will they meet again for the first time on the track when they are running in the opposite direction?

• A. 140 seconds
• B. 150 seconds
• C. 130 seconds
• D. 120 seconds

Answer 1

Answer:

C. 130 seconds

Solution: Given: X and Y start from the same point and at the same time at speeds of 54 km/h and 63 km/h. Distance = 4225 m Formula used: Distance = relative speed × time Calculations: The relative speed of both in the opposite direction = S2 + S1 = 54 + 63 =117 km/h = 117 * (5/18) = 65/2 m/s. So, Time is taken by them to meet for the first time on the track while running in opposite direction = Length of track / relative speed in opposite direction = 4225/(65/2) = 130 seconds Hence, The Required time is 130 seconds.