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1. A train passes a 50 meter long platform in 14 seconds and a man standing on platform 10 seconds.The speed of the train is?

A. 24 km/hr

B. 36 km/hr

C. 40 km/hr

D. 45 km/hr

Solution:

\begin{aligned} Distance travelled in 14 sec \\ =  50 + l \\ Distance travelled in 10 sec \\ = l \\ So speed of train \\ = \frac{50}{14 - 10} m/sec \\ = \frac{50}{4} \times \frac{18}{5} km/hr \\ =   45 km/hr \end{aligned}

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