A train 1200m long crosses a platform in 1.5 min at a speed of 54 kmph . What is the length of the platform? A.150m b.120m c.175m d.100m
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Let the legth of a platform be X m.
Time = 1.5 × 60sec.= 90sec.
speed = 54 × 5/18 = 15 m/s.
distance = (1200× X)m.
using,
distance = speed × time
(1200× X) = 15 × 90
(1200× X) = 1350
X = 1350-1200
X = 150
Therefore,
The length of the platform is 150m.
Time = 1.5 × 60sec.= 90sec.
speed = 54 × 5/18 = 15 m/s.
distance = (1200× X)m.
using,
distance = speed × time
(1200× X) = 15 × 90
(1200× X) = 1350
X = 1350-1200
X = 150
Therefore,
The length of the platform is 150m.
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