Mail us

A train running at a speed of 90 km/hr crosses a tree in 6 sec. What is its length?

Distance = speed x time Speed = 90 km/hr = (90x1000)/3600 m/sSpeed = 25 m/sLength = Distance covered = 25 * 6 = 150 m

So Length of the train = 150 m

There is no comments

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

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

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