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**

** Justification:**

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**