Question

A car moves for half of its time at 80 km/h and for rest
half of time at 40 km/h. Total distance covered is 60
km. What is the average speed of the car
1. 60
2.80
3. 120
4. 180​

Answer 1

Answer: 60 Km/Hr

Explanation:

average speed=total distance covered/total time taken

 

Let total time taken to cover the distance=2T

so total distance=60=80T+40T   ........accordingly

T=1/2  hr

so avg speed=60/2T=60 km/h