A car takes 3 hours to reach the destination by travelling at the speed of 45 kilometre per hour. How long will it take when the car travels at the speed of 90 kilometre per hour?
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Step-by-step explanation:
As speed increases, time taken decreases in same proportion. So the time taken and varies inversely to the speed of the vehicle for the same distance.
80
60
=
4
x
60×x=80 and 4÷x=y
60×4=80×x x=
60
80
x=
80
60×4
=3 hr 4÷
60
80
=y
y=
80
4×60
=3 hr
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