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 one
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 = 8   (l+180)/s = 20   (l+180)/l = 20/8 =5/2   2l+360 =5*l   3*l= 360   l=120 mtrs   s= l/8 = 120/8= 
<gadget id="calculator">120/8</gadget>
<output>15</output>
15 m/sec   ANSWER:15 m/sec
<result>B</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.