Two trains each 250 m in length are running on the same parallel lines in opposite directions with the speed of 90 kmph and 70 kmph respectively. In what time will they cross each other completely? Choose the correct answer:
A) 15 sec
B) 19 sec
C) 12 sec
D) 10 sec
E) 11.25 sec
11.25 secxplanation:   D = 250 m + 250 m = 500 m   RS = 90 + 70= 
<gadget id="calculator">90 + 70</gadget>
<output>160</output>
160 * 5/18= 400/9   T = 500 * 9/400= 
<gadget id="calculator">500 * 9/400</gadget>
<output>45/4 = around 11.25</output>
11.25 sec   Answer: Option 11.25 sec
<result>E</result>
Two trains each 250 m in length are running on the same parallel lines in opposite directions with the speed of 90 kmph and 70 kmph respectively. In what time will they cross each other completely?