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A train moves with a speed of 126 km/hr. Convert it to m/sec.

a km/hr = (a x 1000)/3600 m/sec

126 km/hr = (126*1000)/3600 m/sec

So 126 km/hr = 35 m/sec

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2 trains, 100 m and 120 m long are running in the same direction with speeds of 72 km/hr and 54 km/hr. In how much time will the first train cross the second?

Relative speed of trains = 72 - 54 = 18km/hr18km/hr = 5 m/sec

Distance = 100 + 120 = 220 mTime taken = Distance / SpeedTime taken = 220/5 = 44 sec

A train is moving at a speed of 132km/hr. If length of train is 110 m, how long will it take to cross a platform 165 m long?

Speed = 132 km/hr = (132*1000)/3600 m/secSpeed = (110/3)m/secDistance covered = Length of Train + Platform LengthDistance covered = 110 + 165 = 275 mTime taken = Distance covered/SpeedTime taken = 275 / (110/3) = 7.5 sec

A 150 m long train crosses a bridge of length 250 m in 30 sec. Find the time the train takes to cross a platform 130 m long.

Distance = 150 + 250 = 400 mSpeed = 400/30 = (40/3) m/sec

Next distance = 150 + 130 = 280 mTime taken = 280/(40/3) = 21 sec