A 180 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 the correct choice from the following answers
A) 320 meter	B) 225 meter	C) 230 meter	D) 235 meter	E) None of these
Explanation:   320 meters trains are running in opposite directions so their relative speed will get added   So, Relative speed = 120 +80= 
<gadget id="calculator">120 +80</gadget>
<output>200</output>
200 kmph= 200*(5/18) = 500/9 m/sec   Let the length of other train is x meter then   x+180 /9=500 /9   =&gt;x+180=500   =&gt;x=320   So the length of the train is 320 meters   Option 320 meter
<result>A</result>
A 180 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?