a train 100 m long passes another train coming from opposite direction in 9 seconds . if the speed be 38 km/hr and 38 km /hr respectively. find the length of other train
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Let the speed of the slowest train be x m/sec.
Then, speed of the fastest train = 2x m/sec.
Relative speed = (x + 2x) m/sec = 3x m/sec.
100 + 100/8 =3x
⇒24x=200
⇒24x=200
⇒x= 25/3
So, speed of the faster train = 3/50m/sec
50/3 x 18/5 km/hr
=60km/hr
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