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Question

A car covers a certain distance in 4 hours if it is travelling at a speed of 60 km/hr. How much time would it have taken if it were travelling 20 km/hr faster ?

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Solution

Let the car travelled xkm in 4 hours travelling with the spped of 60km/hr.
As we know that,
speed=distancetime
Distance travelled by the car =60×4=240km
Now the time taken by the car to cover the same distance when travelling 20km/hr- faster
Time taken =distance travelledspeed of car=24080=3 hours

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