Two Indian Railway trains of equal length 100 meters are moving in opposite directions on parallel tracks. The trains cross each other in 20 seconds. If one train is moving twice as fast as the other train, find the speed of the faster train?
Question
Two Indian Railway trains of equal length 100 meters are moving in opposite directions on parallel tracks. The trains cross each other in 20 seconds. If one train is moving twice as fast as the other train, find the speed of the faster train?
Let the speed of the slower train = X m/sec
Then, the speed of the faster train will be = 2X m/sec
Relative Speed = X + 2X = 3X m/sec
Relative Speed is also = (100+100)/20 =200/20 = 10
3X=10
X=(10/3)*(18/5) = 12 Km/hr
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