A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train and its speed Choose the correct option
A) 50 km  B) 52 km  C) 54 km  D) 56 km  E) 58 km
Explanation:   Let the length of the train be x meters,   Then, the train covers x meters in 8 seconds and (x + 180) meters in 20 sec   x/8=(x+180)/20 ⇔ 20x = 8 (x + 180) &lt;=&gt; x = 120   Length of the train = 120 m.   Speed of the train = (120/8)m / sec = m / sec = (15 ×18/5)kmph = 54 km   Answer: Option 54 km
<result>C</result>
A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train and its speed