21.  A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is?


50 m
150 m
200 m
Data inadequate


Answer

 Option

Let the length of the train be x meters and its speed be y m/sec They x/y =15 Y=x/15 x+100/25 = x/15 x=150 m

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22.  A 300 m long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds.What is the length of the platform?


320 ,m
350 m
600 m
650 m


Answer

 Option

Speed = (300/18) m/sec =50/3 m/sec Let the length of the platform be X meters. then X+300/39 =50/3 = 3(X+300) = 1950 = X = 350m

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23.  A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds.If the speed of the train is 54 km/hr,what is the length of the platform?


120 m
240 m
300 m
None of these


Answer

 Option

Speed = (54*5/18) m/sec = 15 m/sec. Length of the train =(15*20) m = 300m Let the length of the platform be X meters Then X+300/36 = 15<=> X+300 = 540 <=> X= 240m

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24.  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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25.  A train of length 150 m takes 40.5 sec to cross a tunnel of length 300 m.What is the speed of the train in km/hr?


13.33
26.67
40
66.67


Answer

 Option

Speed =(150+300/40.5) A meter per second = (450/40.5*18/5) km/hr = 40 km/hr

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