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A train 100 m long, crosses a man standing nearby in 4 sec. Find its speed in km/hr.

Speed = distance / time

Speed = 100/4 = 25 m/sec

Answer options are given in km/hr. Convert m/sec into km/hr

25 m/sec = (25x3600)/1000 km/hr = 90 km/hr

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A toy train crosses 210 and 122 m long tunnels in 25 and 17 sec respectively. Find the train's length.

Let length of train = x metersSpeed = Distance/TimeFirst distance = 210 + xTime = 25 sec

2nd distance = 122 + xTime = 17 sec

Speed = (210 + x)/25 = (122 + x)/17x = 65 m

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 train 150 m long, running at a speed of 120 km/hr, will cross a pole on the way in how many seconds?

Time = Distance / SpeedSpeed = 120 km/hr = (120*1000)/3600 m/s Speed = (100/3) m/s

Time = 150/(100/3) = 4.5 sec