Two trains each 250 m in length are running on the same parallel lines in opposite directions with the speed of 80 kmph and 40 kmph respectively. In what time will they cross each other completely?
Choices: A) 15 sec B) 19 sec C) 12 sec D) 10 sec E) 11 sec
Explanation:   D = 250 m + 250 m = 500 m   RS = 80 + 40= 
<gadget id="calculator">80 + 40</gadget>
<output>120</output>
120 * 5/18= 100/3   T = 500 * 3/100= 
<gadget id="calculator">500 * 3/100</gadget>
<output>15</output>
15 sec   15 secnswer: Option 15 sec
<result>A</result>
Two trains each 250 m in length are running on the same parallel lines in opposite directions with the speed of 80 kmph and 40 kmph respectively. In what time will they cross each other completely?