Two trains 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 (in seconds) which they take to cross each other, is:
Choose the correct choice from the following answers:
A) 9	B) 9.6	C) 10	D) 10.2	E) 10.8
Relative speed of the trains=60+40= 
<gadget id="calculator">60+40</gadget>
<output>100</output>
100km/hr=100*5/18 m/s=250/9   Time taken to cross each other=total distance/speed   300/250/9=54/5= 
<gadget id="calculator">54/5</gadget>
<output>54/5 = around 10.8</output>
10.8sec   ANSW10.8R:10.8
<result>E</result>
Two trains 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 (in seconds) which they take to cross each other, is: