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 one:  A) 10.8 s  B) 12 s  C) 9.8 s  D) 8 s  E) 7 s
Explanation:   Distance = 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   10.8 snswer: Option 10.8 s
<result>A</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