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Question -

A car takes 2 hours to reach a destination by traveling at a speed of 60 km/h. How long will it take when the car travels at the speed of 80 km/h?



Answer -

On increasing the speed, it will take less time to travel a distance.
Thus the two quantities are in inverse proportions.

Speed in km/h

Time in hour

60

2

80

x

Let the required timesbe x hours.
x1y1┬а= x2y2
60 ├Ч 2 = 80 ├Ч x
x =┬а3/2┬аhours = 1(1/2)┬аhrs.
Hence, the required time = 1(1/2)┬аhours.

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