Two trains 300m and 400m long run at the speeds of 40 kmph and 50kmph respectively in opposite Directions on parallel tracks. The time taken to cross each other? Choose the correct choice from the following options.
A) 28sec	B) 20sec	C) 30sec	D) 15sec	E) 25sec
Length of two Trains = 300m + 400m = 700m   Total Speed300  + 400= 
<gadget id="calculator">300  + 400</gadget>
<output>700</output>
700m   Total Speed= 40 Kmph + 50 Kmph (Opposite Direction)   = 90 Kmph   Time = Distance/Speed   Time = 700/ 90   Time = 28Sec   28secNSWER 28sec
<result>A</result>
Two trains 300m and 400m long run at the speeds of 40 kmph and 50kmph respectively in opposite Directions on parallel tracks. The time taken to cross each other?