Two trains 120 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 answer:
A) 10.9
B) 10.7
C) 10.3
D) 10.08
E) 10.2
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 = 120 + 160= 
<gadget id="calculator">120 + 160</gadget>
<output>280</output>
280 m.   Required time= 280 * 9/250 = 252/25= 
<gadget id="calculator">252/25</gadget>
<output>252/25 = around 10.08</output>
10.08 sec.   'Answer: 10.08
<result>D</result>
Two trains 120 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?