Two trains are moving at 80 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?  Select.
A) 6 sec	B) 7 sec	C) 7 2/2 sec	D) 8 sec	E) 9 sec
70 + 80= 
<gadget id="calculator">70 + 80</gadget>
<output>150</output>
150 * 5/18= 125/3 mps   D = 150 + 100= 
<gadget id="calculator">150 + 100</gadget>
<output>250</output>
250 m   T= 250 * 3/125= 
<gadget id="calculator">250 * 3/125</gadget>
<output>6</output>
6 sec   6 secnswer: 6 sec
<result>A</result>
Two trains are moving at 80 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?