26.  The length of train and that of platform are equal. If with a speed of 90 km/hr, the train crosses the platform in one minute, then the length of the train (in meters) is?


500
600
750
900


Answer

 Option

Speed = (90*5/18) m/sec =25 m/sec; time 1 min. = 60 sec. Let the length of the train and that of the platform be x meters. then, 2x/60 =25 <=> x = 25*60/2 =750.

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27.  A good train runs at the speed of 72 km/hr and crosses a 250 m long platform in 26 seconds. What is the length of the good train?


230 m
240 m
260 m
270 m


Answer

 Option

Speed = (72*5/18) m/sec =20 m/sec; time =26 sec. Let the length of the train be x meters. Then, x+250/26 = 20 <=> x+ 250 =520 <=> x =270 m.

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28.  A train 800 meters long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is?


130
360
500
540


Answer

 Option

Speed = (78*5/18) m/sec =(65/3) m/sec. time = 1minute = 60 sec. Let the length of the tunnel be x meters. then, 800+x/60=65/3 <=> 3(800+x) =3900 <=> x =500.

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29.  The length of the bridge, which a train 130 meters long and traveling at 45 km/hr can cross in 30 seconds, is?


245 m
200 m
225 m
250 m


Answer

 Option

Speed =(45*5/18) m/sec = (25/2) m/sec; time = 30 sec. Let the length of bridge be x meters. Then, 130+x/30 = 25/2 <=> 2(130+x) =750 <=> x = 245 m.

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30.  A train 240 m long passed a pole in 24 seconds. How long will it take to pass a platform 650 m long?


65 sec
89 sec
100 sec
150 sec


Answer

 Option

Speed = (240/24) m/sec = 10 m/sec. Therefore required time = (240+650/10) sec = 89 sec.

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