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
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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
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
Answered by
0
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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