A man sitting in a train which is travelling at 50 kmph observes that a goods train, travelling in opposite direction, takes 9 seconds to pass him. If the goods train is 280 m long, find its speed?  Options.
A) 52 kmph.	B) 62 kmph.	C) 72 kmph.	D) 80 kmph.	E) None
Solution   Relative Speed	= (280 / 9)m/sec   = (280/9 x 18/5)   = 112 kmph.   Speed of the train	= (112 - 50)= 
<gadget id="calculator">(112 - 50)</gadget>
<output>62</output>
62 kmph.   Answer 62 kmph.
<result>B</result>
A man sitting in a train which is travelling at 50 kmph observes that a goods train, travelling in opposite direction, takes 9 seconds to pass him. If the goods train is 280 m long, find its speed?