A car travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs. What is the distance traveled  Choose the correct choice from the following options: A) 210 kms B) 30 kms C) 20 kms D) 40 kms E) none of these

Rationale: if x is the distance , then difference in speeds = x / 5 - x / 7 = 12 2 x / 35 = 12 x = 12 * 35 / 2 = 210 kms . answer : a
Answer: A