31.  A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?


120 meters
180 meters
150 meters
None of these


Answer

 Option

Speed = (60*5/18) m/sec = (50/3) m/sec. Length of the train = (speed * time) = (50/3*9) m = 150 m.

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32.  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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33.  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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34.  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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35.  A train 132 m long passes a telegraph pole in 6 seconds. Find the speed of the train?


70 km/hr
72 km/hr
79.2 km/hr
80 km/hr


Answer

 Option

Speed =(132/6) m/sec = (22*18/5) km/hr = 79.2 km/hr.

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