Two trains 140 metre and 160 metre long run at the speed of 60 km/hr and 40 km/hr respectively in opposite direction on parallel tracks. What time these will take to cross each other ?	Choose the correct choice from the following answers:  A) 10.7 Seconds  B) 10.8 Seconds  C) 10.9 Seconds  D) 11.8 Seconds  E) None of these
Explanation:   Relative Speed = 60+40= 
<gadget id="calculator">60+40</gadget>
<output>100</output>
100 Kmph= 100*(5/18) = 250/9 m/sec   Distance to be covered = 140 + 160= 
<gadget id="calculator">140 + 160</gadget>
<output>300</output>
300 metres   Time= Distance/Speed   Time=300∗9/250=54/5= 
<gadget id="calculator">54/5</gadget>
<output>54/5 = around 10.8</output>
10.8 seconds   Option 10.8 Seconds
<result>B</result>
Two trains 140 metre and 160 metre long run at the speed of 60 km/hr and 40 km/hr respectively in opposite direction on parallel tracks. What time these will take to cross each other ?