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1. A train of length 500 feet crosses a platform of length 700 feet in 10 seconds. The speed of the train is?

A. 70 ft/second

B. 85 ft/second

C. 100 ft/second

D. 120 ft/second

Solution:

\begin{aligned} Speed of the train \\ = \frac{700 + 500}{10} \\ =  120 ft/second \end{aligned}

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