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1. A train passes by a lamp post at platform in 7 sec. and passes by the platform completely in 28 sec. If the length of the platform is 390m, then length of the train (in meters) is?

A. 120 m

B. 130 m

C. 140 m

D. 150 m

Solution:

Length of train

= \frac{Length of the platform}{Difference in time}

× (Time taken to cross a lamp post)

\begin{aligned} = \frac{390}{28 - 7} \times 7 \\ = \frac{390}{21} \times 7 \\ = \frac{390}{3} \\ = 130 m \end{aligned}

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