A 240 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
Choose one:
A) 230m  B) 240m  C) 250m  D) 260m  E) 270m
speed = (120 + 80)km/h (because direction is opposite hence relative velocity is added)= 500/9 m/s   time= 9sec   let the lenght of second train is x   total distance covered= 240 + x   therefore, 260m= speed*time   thus 240 + x = 500/9 * 9= 
<gadget id="calculator">500/9 * 9</gadget>
<output>500</output>
500-240= 
<gadget id="calculator">500-240</gadget>
<output>260</output>
260 m   ANSWER:260m
<result>D</result>
A 240 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?