Two trains 190 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? Pick:
A) 10.6 sec  B) 18.8 sec  C) 14.6 sec  D) 10.8 sec  E) 12.6 sec
Relative speed = 60 + 40= 
<gadget id="calculator">60 + 40</gadget>
<output>100</output>
100 km/hr.= 100 * 5/18 = 250/9 m/sec.   Distance covered in crossing each other = 190 + 160= 
<gadget id="calculator">190 + 160</gadget>
<output>350</output>
350 m.   Required time= 350 * 9/250 = 63/5= 
<gadget id="calculator">63/5</gadget>
<output>63/5 = around 12.6</output>
12.6 sec.   Answer: 12.6 sec
<result>E</result>
Two trains 190 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?