A 270 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 seconds. What is the length of the other train?

A 230 m
B 240 m
C 260 m
D 320 m

Correct Answer: 230 m

Relative speed = 120 + 80 = 200 km 200km = 200 ×1000 = 200000m60 min  = 60×60 = 3600 sec3600 sec  = 200000m1 "  = 20000036009 "    = 200000×93600 = 500 mThe length of other train  = (500 - 270)m = 230 m 
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