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 10 seconds. Find the length of the train and its speed.	Choose the correct choice.
A) 10 m/sec
B) 15 m/sec
C) 18 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 = 10   (l+180)/s = 20   (l+180)/l = 20/10= 
<gadget id="calculator">20/10</gadget>
<output>2</output>
2   l+180=2l   l= 180   l=180 mtrs   s= l/10 = 180/8 = 10 m/sec   10 m/secNSWER:10 m/sec
<result>A</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 10 seconds. Find the length of the train and its speed.