Discussion
A train moves fast a telegraph post and a bridge 264 m long in 8 sec and 20 sec respectively. What is the speed of the train?
Answer: D
The post crossing covers the train alone; the bridge crossing adds 264 m.
\[ L = 8v, \qquad L + 264 = 20v \]
\[ 12v = 264 \quad\Longrightarrow\quad v = 22 \text{ m/s} \]
\[ 22 \times \frac{18}{5} = 79.2 \text{ km/hr} \]
The train works out at 176 m long, though the question asks only for the speed.
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