Question

Two cities P and Q are 360 km apart from each other. A car goes from P to Q with a speed of 40km per hour and returns back to P with a speed of 50 km per hour. Whta is the average speed of the car?
1. 44.44 km per hour
2. 48 km per hour
3. 50 km per hour
4. 55 km per hour

Answer 1

Correct Answer - Option 1 : 44.44 km per hour

Given:

Distance between the two cities = 360 km

Formula used:

Average speed = Total distance/Total time

Distance = Speed × Time

Calculation:

Time taken by car A to cover distance from P to Q = 360/40 = 9 hours

Time taken by car A to cover distance from Q to P = 360/50 = 7.2 hours

Average speed = (360 + 360)/(9 + 7.2) = 44.44 km/hr

∴ The average speed of the car is 44.44 km/hr