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Question

A train covers 10 km in 2 hours, then it will cover km in 4 hours (the speed of the train is constant).

A
30
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B
20
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C
10
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D
40
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Solution

The correct option is B 20
Distance ∝ Time (Speed is constant).

We know that, if two quantities are directly proportional, then the ratio between the two quantities is constant.

Distance travelledTime taken=Constant

Distance(km)10?Time(hr)24

102 = x4

x=10×42

x=20 km

Therefore, distance covered by the train in 4 hours is 20 km.

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