Two trains are moving at 50 kmph and 70 kmph in opposite directions. Their lengths are 170 m and 100 m respectively. The time they will take to pass each other completely is?
Choose the correct option:
A) 3 sec	B) 8 sec	C) 9 sec	D) 5 sec	E) 7 sec
70 + 50= 
<gadget id="calculator">70 + 50</gadget>
<output>120</output>
120 * 5/18= 100/3 mps   D = 170 + 100= 
<gadget id="calculator">170 + 100</gadget>
<output>270</output>
270 m   T= 270 * 3/100 = 8 sec   ANSWER:8 sec
<result>B</result>
Two trains are moving at 50 kmph and 70 kmph in opposite directions. Their lengths are 170 m and 100 m respectively. The time they will take to pass each other completely is?