Two trains 140m and 160m long run at the speed of 60kmph and 48kmph in opposite directions in parallel tracks. The time which they take to cross each other is?
Choose the correct answer.
A) 5.6sec B) 8.9sec C) 10 sec D) 12.6sec E) 15sec
Relative speed = 60+48= 
<gadget id="calculator">60+48</gadget>
<output>108</output>
108 kmph * 5/18= 30 m/s   Distance covered in crossing each other = 140+160= 
<gadget id="calculator">140+160</gadget>
<output>300</output>
300m   Required time= 300*1/30= 
<gadget id="calculator">300*1/30</gadget>
<output>10</output>
10 sec   Answer is 10 sec
<result>C</result>
Two trains 140m and 160m long run at the speed of 60kmph and 48kmph in opposite directions in parallel tracks. The time which they take to cross each other is?