Two trains 200 m and 150 m long are running on parallel rails at the rate of 40 kmph and 42 kmph respectively. In how much time will they cross each other, if they are running in the same direction? Choose the correct choice from the following
A) 72 sec
B) 132 sec
C) 192 sec
D) 252 sec
E) None
Solution   Relative Speed	= (42 - 40 )= 
<gadget id="calculator">(42 - 40 )</gadget>
<output>2</output>
2 kmph=(2 x 5 / 18)m/sec   = (10 / 18 ) m/sec   Time taken	= (350 x 18 / 10) sec   = 630 sec.   Answer None
<result>E</result>
Two trains 200 m and 150 m long are running on parallel rails at the rate of 40 kmph and 42 kmph respectively. In how much time will they cross each other, if they are running in the same direction?