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1. A train of length 150 meters takes 40.5 seconds to cross a tunnel of length 300 meters. What is the speed of the train in km/hr?

A. 13.33

B. 26.67

C. 40

D. 66.67

Solution:

\begin{aligned} Speed  = (\frac{150 + 300}{40.5}) m / \sec \\ = (\frac{450}{40.5} \times \frac{18}{5}) k m / h r \\ = 40 k m / h r \end{aligned}

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