A man sitting in a bullet train which is travelling at 50 kmph observes that a goods bullet train , travelling in opposite direction, takes 9 seconds to pass him. If the goods bullet train is 280 m long, find its speed.?
Choose the correct choice from the following.
A) 44 kmph.  B) 52 kmph.  C) 75 kmph.  D) 83 kmph.  E) 62 kmph.
E   62 kmph.   Relative speed = 280/9 m / sec = ((280/9)*(18/5))= 
<gadget id="calculator">((280/9)*(18/5))</gadget>
<output>112</output>
112 kmph.   Speed of goods train= (112 - 50)= 
<gadget id="calculator">(112 - 50)</gadget>
<output>62</output>
62 kmph.
<result>E</result>
A man sitting in a bullet train which is travelling at 50 kmph observes that a goods bullet train , travelling in opposite direction, takes 9 seconds to pass him. If the goods bullet train is 280 m long, find its speed.?