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1. A train 100 meter long meets a man going in opposite direction at 5 km/h and passes him in 7¹/₅ seconds. What is the speed of the train (in km/hr)?

A. 45 km/h

B. 60 km/h

C. 55 km/hr

D. 50 km/hr

Solution:

\begin{aligned} Relative speed of man &  train \\ = \frac{100 \times 5}{36} \times \frac{18}{5} \\ =  50km/hr \\ ∴ speed of train \\ =  50 - 5 \\ =  45 km/hr \end{aligned}

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