If a train covers 10 km in 2 hours, then it will cover _____ km in 4 hours (the speed of the train remains constant).

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Solution

The correct option is D 20
Since, speed is constant.

So, distance ∝ time

$\frac{D_{1}}{T_{1}} = \frac{D_{2}}{T_{2}}$

Given values:

$D_{1} = 10 k m, T_{1} = 2 h o u r s, T_{2} = 4 h o u r s, D_{2} = ?$

Putting in the values, we get,
$\frac{10}{2} = \frac{D_{2}}{4}$

$D_{2} = \frac{10}{2} \times 4$

$D_{2} = 20 k m$

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