Two trains 130 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 the correct choice from the following: A) 10.9 B) 10.7 C) 10.3 D) 10.44 E) 10.8
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 = 130 + 160= 
<gadget id="calculator">130 + 160</gadget>
<output>290</output>
290 m.   Required time= 290 * 9/250 = 261/25= 
<gadget id="calculator">261/25</gadget>
<output>261/25 = around 10.44</output>
10.44 sec.   'Answer: 10.44
<result>D</result>
Two trains 130 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?