A 270 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= 270 + x   therefore, D= speed*time   thus 270 + x = 500/9 * 9= 
<gadget id="calculator">500/9 * 9</gadget>
<output>500</output>
500-270= 
<gadget id="calculator">500-270</gadget>
<output>230</output>
230 m   230mNSWER:230m
<result>A</result>
A 270 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?