How much time will a train of length 300 m moving at a speed of 72 kmph take to cross another train of length 500 m, moving at 36 kmph in the same direction?	Pick one:	A) 50	B) 80	C) 88	D) 76	E) 12
The distance to be covered = Sum of their lengths = 300 + 500= 
<gadget id="calculator">300 + 500</gadget>
<output>800</output>
800 m.   Relative speed= 72 -36= 
<gadget id="calculator">72 -36</gadget>
<output>36</output>
36 kmph= 36 * 5/18= 
<gadget id="calculator">36 * 5/18</gadget>
<output>10</output>
10 mps.   Time required= d/s = 800/10= 
<gadget id="calculator">800/10</gadget>
<output>80</output>
80 sec.   Answer:80
<result>B</result>
How much time will a train of length 300 m moving at a speed of 72 kmph take to cross another train of length 500 m, moving at 36 kmph in the same direction?