26.  A train moves with a speed of 108 km/hr.Its speed in meters per second is?


10.8m/sec
18 m/sec
30 m/sec
38.8 m/sec


Answer

 Option

108 km/hr= (108*5/18) = 30m/sec

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27.  A train moves past a telegraph post and a bridge 264m long in 8 seconds and 20 seconds respectively.What is the speed of the train?


69.5 km/hr
70 km/hr
79 km/hr
79.2 km/hr


Answer

 Option

Let the length of the train be x meters and its speed be y m/sec They x/y = 8 = x= 8y Now x+264/20 =y 8y+264 =20y y=22 Speed =22m/sec =(22*18/5)km/hr = 79.2 km/hr

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


7 sec
7 1/2 sec
6 1/2 sec
6 sec


Answer

 Option

Speed of train = (132 *5/18) m/sec = (110/3)m/sec Distance covered in passing the platform= (110+165) =275 m Therefore time taken = (275*3/110) sec = 15/2 sec= 7 1/2 sec

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29.  A train crosses a platform 100 m long in 60 sec at a speed of 45 km/hr.The time taken by the train to cross an electric pole is?


8 sec
52 sec
1 minute
data inadequate


Answer

 Option

Speed = (45*5/18) m/sec = (25/2) m/sec Let the length of the train be X meters. Then X+100 /(25/2) = 60 Therefore time taken by the train to cross an electric pole =(650*2/25) seconds = 52 seconds

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30.  A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train is?


90 m
100 m
140 m
120 m


Answer

 Option

Speed = (12/10*60) km/hr = (72*5/18) m/sec. Length of the train = (speed*time) = (20*6) m = 120 m.

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