Question

A car takes 7 hours to cover a certain distance at the speed of 48 km/hr.If the speed is decreased by 20 km/hr . How much time will it take to cover the same distance

Answer 1

let the distance it travelled be = x km
                               time taken = 7 hours
                               speed         =48 km/h
we know that d=st
                      x=48(7)=336km
now decreased speed = 48-20=28km/h
                     distance=336km
                      time=d/s
                             =336/28=12 hours
       therefore it takes 12 hours
    

Answer 2

Given : A car take 7 hours to cover a certain distance at the speed of 48 km/hr .

To Find : If the speed is decreased by 20 km/hr, how much time will it take to cover the same distance ?​

Solution:

Distance = Speed * Time

=> Distance = 48 * 7  km

speed is decreased by 20 km/hr,

new speed = 48 - 20 = 28 km/hr

New time = T hrs

Distance = 28 * T  km

28 * T =  48 * 7

=> 4 * T = 48

=> T = 12

Hence 12 hours will be taken

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