Question

,

Two trains are running towards each-other from two
opposite points A and B cross each other in 24 seconds.
The speed of faster train is 200/3% more than that of
slower train. If speed of slower train is 54 km/hr and it
crosses a pole in 12 seconds then what is the length of

faster train?


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Answer 1

Two goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one.

A.12 secB.24 secC.48 secD.60 sec

Answer: Option B

Explanation:

Relative speed == (45 + 30) km/hr=75 x5m/sec18=125m/sec.6

We have to find the time taken by the slower train to pass the DRIVER of the faster train and not the complete train.

So, distance covered = Length of the slower train.

Therefore, Distance covered = 500 m.

 Required time =500 x6= 24 sec.125

Two trains are running in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, then the speed of each train (in km/hr) is:

A.10B.18C.36D.72

Answer: Option C

Explanation:

Let the speed of each train be x m/sec.

Then, relative speed of the two trains = 2x m/sec.

So, 2x =(120 + 120)12

 2x = 20

 x = 10.

 Speed of each train = 10 m/sec =10 x18km/hr = 36 km/hr.5

Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

A.10B.12C.15D.20

Answer: Option B

Explanation:

Speed of the first train =120m/sec = 12 m/sec.10

Speed of the second train =120m/sec = 8 m/sec.15

Relative speed = (12 + 8) = 20 m/sec.

 Required time =(120 + 120)sec = 12 sec.20