A 220 m long train running at the speed of 120 km/hr crosses another train running in opposite direction at the speed of 80 km/hr in 9 sec. What is the length of the other train?	Select.
A) 280
B) 270
C) 260
D) 250
E) 240
Relative speed = 120 + 80= 
<gadget id="calculator">120 + 80</gadget>
<output>200</output>
200 km/hr.= 200 * 5/18 = 500/9 m/sec.   Let the length of the other train be x m.   Then, (x + 220)/9 = 500/9 =&gt; x = 280.   280nswer: Option 280
<result>A</result>
A 220 m long train running at the speed of 120 km/hr crosses another train running in opposite direction at the speed of 80 km/hr in 9 sec. What is the length of the other train?