16.  A 270 meters long train running at the speed of 120 km/ph crosses other train running in opposite direction at the speed of 80 km/ph in 9 seconds.What is the length of the other train?


230 m
240 m
260 m
320 m


Answer

 Option

Relative speed = (120+80) km/hr = (200*5/18)m/sec = (500/9) m/sec Let the length of the other train be x meters Then x+270/9 =500/9 = x+270 = 500 = x =230 m

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17.  Two train 200 m and 150 m long are running on parallel rails at the rate of 40 km/ph and 45 km/ph respectively. In how much time will they cross each other if they are running in the same direction?


72 sec
132 sec
192 sec
252 sec


Answer

 Option

Relative speed = (45 - 40) km/ph = 5 km/ph =( 5*5/18)m/sec = (25/18) m/sec Total distance covered = sum of lengths of the trains = 350 m Time taken =(350*18/25) sec = 252 seconds

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18.  Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction.Fast train completely passes a man sitting in the slower train in 5 seconds.What is the length of the fast train?


23 m
23 2/9 m
27 m
27 7/9 m


Answer

 Option

Relative speed =( 40-20) km/hr = (20*5/18) m/sec = (50/9)m/sec Length of faster train = (50/9*5)m = 250/9 m = 27 7/9 m

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19.  A man sitting in a train which is traveling at 50 km/hr observes that a good train traveling in opposite direction takes 9 seconds to pass him. If the goods train is 280 m long find its speed?


65 km/hr
60 km/hr
64 km/hr
62 km/hr


Answer

 Option

Relative speed =(280/9) m/sec = (280/9*18/5) km/hr = 112 km/hr Hence speed of the goods train =(112 - 50) = 62km/hr

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20.  Two trains travel in opposite directions at 36 km/ph and 45 km/ph and a man sitting in slower train passes the faster train in 8 seconds.The length of the faster train is?


80 m
100 m
120 m
180 m


Answer

 Option

Relative speed =(36+45) km/hr =(81*5/18) m/sec = (45/2) m/sec Length of train =(45/2*8) m =180 m

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