A man sitting in a train which is travelling at 50 kmph observes that a goods train travelling in a opposite direction, takes 9seconds to pass him. If the goods train is 280 m long, find its speed.
Choices:
A) 58  B) 62  C) 74  D) 81  E) 65
Relative speed = (280/9)m/s = (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   Answer is 62
<result>B</result>
A man sitting in a train which is travelling at 50 kmph observes that a goods train travelling in a opposite direction, takes 9seconds to pass him. If the goods train is 280 m long, find its speed.