In what time will two trains cross each other completely, which are running on the same parallel lines in opposite directions, each 100 m in length both trains running with a speed of 80 kmph?	Answers:
A) 4.5 sec	B) 4.8 sec	C) 4.2 sec	D) 5.0 sec	E) 5.2 sec
D = 100m + 100m = 200m * 1/1000 100  + 100= 
<gadget id="calculator">100  + 100</gadget>
<output>200</output>
200m * 1/1000 = 0.2 kms   RS 200  * 1/1000= 
<gadget id="calculator">200  * 1/1000</gadget>
<output>1/5 = around 0.2</output>
0.2 kms   RS= 80 + 80= 
<gadget id="calculator">80 + 80</gadget>
<output>160</output>
160 kmph   T= (0.2/160) * 3600= 
<gadget id="calculator">(0.2/160) * 3600</gadget>
<output>4.5</output>
4.5 sec   4.5 secNSWER:4.5 sec
<result>A</result>
In what time will two trains cross each other completely, which are running on the same parallel lines in opposite directions, each 100 m in length both trains running with a speed of 80 kmph?