Two trains 160 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) 10.7  B) 10.9  C) 10.52  D) 11.52  E) 18.82
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 = 160 + 160= 
<gadget id="calculator">160 + 160</gadget>
<output>320</output>
320 m.   Required time= 320 * 9/250= 
<gadget id="calculator">320 * 9/250</gadget>
<output>288/25 = around 11.52</output>
11.52 sec.   Answer:11.52
<result>D</result>
Two trains 160 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?