A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 24 seconds but himself in 8 seconds. Find the length of the train and its speed. Answers.
A) 10 m/sec B) 15 m/sec C) 11.25 m/sec D) 19 m/sec E) 25 m/sec
If length of train is l and speed of train is s, then   l/s = 8   (l+180)/s = 24   (l+180)/l = 24/8= 
<gadget id="calculator">24/8</gadget>
<output>3</output>
3   l+180=3*l   2*l= 180   l=90 mtrs   s= l/8 = 90/8= 
<gadget id="calculator">90/8</gadget>
<output>45/4 = around 11.25</output>
11.25 m/sec   ANSWER:11.25 m/sec
<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 24 seconds but himself in 8 seconds. Find the length of the train and its speed.