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The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:

 
A. 200 m
B. 225 m
C. 245 m
D. 250 m

Answer: Option C

Explanation:

Speed = 45 x 5 m/sec = 25 m/sec.
18 2

Time = 30 sec.

Let the length of bridge be x metres.

Then, 130 + x = 25
30 2

 2(130 + x) = 750

 x = 245 m.

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

A. 45 km/hr
B. 50 km/hr
C. 54 km/hr
D. 55 km/hr

Answer: Option B

Explanation:

Speed of the train relative to man = 125 m/sec
10
   = 25 m/sec.
2
   = 25 x 18 km/hr
2 5

= 45 km/hr.

Let the speed of the train be x km/hr. Then, relative speed = (x – 5) km/hr.

 x – 5 = 45          x = 50 km/hr.

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