A car runs for one hour with a speed 60 km per hour, for 2 hours with a speed 70 km per hour and for 5 hours with a speed 50 km per hour. What is the average speed of the car in km per hour?

Correct option is A

Given:

A car runs for 1 hour at 60 km/h

A car runs for 2 hours at 70 km/h

A car runs for 5 hours at 50 km/h

We need to find the average speed of the car.

Formula Used:

Average Speed = $$\frac{\text{Total Distance}}{\text{Total Time}}$$​​

Solution:

For 1 hour at 60 km/h: 60 × 1 = 60 km

For 2 hours at 70 km/h: 70 × 2 = 140 km

For 5 hours at 50 km/h: 50 × 5 = 250 km

Total Distance = 60 + 140 + 250 = 450 km

Total Time = 1 + 2 + 5 = 8 hours

Average Speed = $$\frac{450}{8}$$​ = 56.25 km/h

The average speed of the car is 56.25 km/h