11.  A train 110 m long passes a man running at 6 km/ph in the direction opposite to that of train in 6 seconds,the speed of the train is?


54 km/hr
60 km/hr
66 km/hr
72 km/hr


Answer

 Option

Speed of the train relative to man =(110/6) m/sec = (110/6*18/5) km/hr = 66 km/hr Let the speed of train be x km/ph. Then relative speed = (x+6) km/ph X= 60 km/hr

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12.  A train 125m long passes a man running at 5 km /ph in the same direction in which the train is going in 10 seconds.The speed of the train is?


40 km/hr
50 km/hr
54 km/hr
55 km/hr


Answer

 Option

Speed of the train relative to man = (125/10) m/sec =(25/2) m/sec =(25/2*18/5) km/hr =45km/hr Let the speed of the train be x km/ph. Then relative speed = (x-5) km/ph x-5 =45 X= 45+5 =50 km/hr

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13.  Two trains are moving opposite direction at 60 km/hr and 90 km/hr.Their lengths are 1.10 km/hr and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is?


36
45
48
49


Answer

 Option

Relative speed = ( 60+90) km/hr (150*5/18)m/sec =(125/3) m/sec Distance covered =( 1.10+0.9)km =2 km =2000m Required time =(2000*3/125) sec = 48 seconds

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14.  Two trains 140 m and 160 m long run at the speed of 60km/hr and 40 km/hr respectively in opposite directions on parallel tracks.The time (in seconds) which they take to cross each other is?


9
9.6
10
10.8


Answer

 Option

Relative speed = ( 60+40) km/hr = (100*5/18) m/sec =(250/9) m/sec Distance covered in crossing each other = (140+160) m = 300 m Required time =(300*9/250) sec = 54/5 sec = 10.8 sec

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15.  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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