Question

A person covers a certain distance by car at a speed of 30 km/h and comes back at a speed of 40 km/h. The average speed during the travel is

विकल्प

• 34.3 km/h

• 35 km/h

• 37.5 km/h

• 32.8 km/h

Answer 1

34.3 km/h

Explanation:

Average Speed`=(2"xy")/("x+y")`

`⇒(2xx30xx40)/(30+40)=240/7`

=34.3 km/h