Question

a car travels 20 km at uniform speed of 40 km/hr and the next 20 km at uniform speed of 60 km/h find its average speed

Answer 1

The car covers first 20 kilometre in 30 mins

and the next 20 kilometre in 20 minutes

Therefore covers 40 kilometre in 50 mins

So in 50 minutes the car covers 40 kilometre

In 1 minute the car covers 40/50 kilometre

In 60 minute the car covers 40/50 × 60 kilometre = 48 kilometre

The speed of the car will be 48 kilometre per hour

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