Two trains which have lengths of 150 m are running on the same parallel lines in opposite directions with the speed of 80 kmph and 70 kmph respectively. In what time will they cross each other completely?	Choose the correct choice from the following answers.
A) 7.6 B) 7.1 C) 6.8 D) 7.2 E) 6.4
7.2 = 150m + 150m = 300m * 1/1000 150  + 150= 
<gadget id="calculator">150  + 150</gadget>
<output>300</output>
300m * 1/1000 = 0.3 kms   RS 300  * 1/1000= 
<gadget id="calculator">300  * 1/1000</gadget>
<output>3/10 = around 0.3</output>
0.3 kms   RS= 70 + 80= 
<gadget id="calculator">70 + 80</gadget>
<output>150</output>
150 kmph   T= (0.3/150) * 3600= 
<gadget id="calculator">(0.3/150) * 3600</gadget>
<output>7.2</output>
7.2 sec   ANSWER:7.2
<result>D</result>
Two trains which have lengths of 150 m are running on the same parallel lines in opposite directions with the speed of 80 kmph and 70 kmph respectively. In what time will they cross each other completely?