A and B start at the same time with speeds of 40 km/hour and 50 km/hour respectively. If in covering the journey, A taken 15 minutes longer than B, the distance of the journey is :
Answer: C. 50 km
Suppose distance of journey = x km Time taken by A to Cover x km = x/40 hours. Time taken by B to Cover x km = x/50 hours. By Hypothesis, x/40 - x/50 = 15/60 or x/200= 15/60 x = (15 x 20)/6 = 50 km