An woman sitting in a train which is travelling at 20 kmph observes that a goods train travelling in a opposite direction, takes 15 seconds to pass him. If the goods train is 300 m long, find its speed.
Choose the correct choice from the following answers:
A) 52 B) 54 C) 56 D) 58 E) 60
Relative speed = (300/15)m/s = (300/15)*(18/5)= 
<gadget id="calculator">(300/15)*(18/5)</gadget>
<output>72</output>
72 kmph   speed of goods train= 72-20= 
<gadget id="calculator">72-20</gadget>
<output>52</output>
52 kmph   52nswer is 52
<result>A</result>
An woman sitting in a train which is travelling at 20 kmph observes that a goods train travelling in a opposite direction, takes 15 seconds to pass him. If the goods train is 300 m long, find its speed.