Question

On a straight road, a bus is 30 km ahead of a car traveling in the same direction. After 3 hours, the car is 60 km ahead of the bus. If the speed of the bus is 42 km/h, then find the speed of the car.

• A. 67 km/h
• B. 72 km/h
• C. 65 km/h
• D. 59 km/h

Answer 1

Answer:

B. 72 km/h

Relative speed in same direction = Speed of car - speed of the bus speed of the car be x Relative speed = x - 42 km/h Distance = 30 + 60 = 90 km x - 42 = 90/3 x - 42 = 30 x = 30 + 42 = 72 km/h