Two trains having length of 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions (on parallel tracks). The time which they take to cross each other, is	Choose the correct choice from the following answers
A) 10.2  B) 10.4  C) 10.6  D) 10.8  E) 11.2
10.8istance = 140+160= 
<gadget id="calculator">140+160</gadget>
<output>300</output>
300 m   Relative speed= 60+40= 
<gadget id="calculator">60+40</gadget>
<output>100</output>
100 km/hr= (100×10)/36 m/s   Time = distance/speed = 300 / (100×10)/36 = 300×36 / 1000 = 3×36/10 = 10.8 s   Answer is 10.8.
<result>D</result>
Two trains having length of 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions (on parallel tracks). The time which they take to cross each other, is