How long will a train 100m long travelling at 72kmph take to overtake another train 200m long travelling at 54kmph ?	Choose the correct choice from the following choices
A) 60 sec B) 70 sec C) 80 sec D) 50 sec E) 90 sec
72 kmph=72*5/18= 
<gadget id="calculator">72*5/18</gadget>
<output>20</output>
20mps.   54 kmph=54*5/18= 
<gadget id="calculator">54*5/18</gadget>
<output>15</output>
15 mps.   The train has to travel (200+100)= 
<gadget id="calculator">(200+100)</gadget>
<output>300</output>
300m to overtake the other one.   Resultant velocity=(20-15)= 
<gadget id="calculator">(20-15)</gadget>
<output>5</output>
5 mps   time it takes to travel 300m at a velocity of 5 mps is 60 sec..   Ans 60 sec.   60 secNSWER:60 sec
<result>A</result>
How long will a train 100m long travelling at 72kmph take to overtake another train 200m long travelling at 54kmph ?