Two trains, 225m. and 150m. long respectively, are running in the same direction on parallel tracks. The faster train passes over the other train in 90 seconds. If the faster train is running at a speed of 75 km/hr., then fnd the speed of other train. a) 80 km/hr. b) 72 km/hr. c) 60 km/hr. d) 70 km/hr.
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when trains are running in same direction then relative relative speed =54−36=18km/hr=(18×
18
5
)m/sec=5m/sec
Time =30s
Length of the faster train=5×30=150m
When trains are running in opposite direction then relative speed =54+36=90km/hr=(90×
18
5
)m/sec=25m/sec
time=10 s
Length of the trains=25×10=250m
Length of the slower train=250−150=100m
Length of the trains are 100 m and 150 m.
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