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Q.

A train 50 m long passes over a bridge at a velocity of 30 km/h. If it takes 36 s to cross the bridge, the length of the bridge will be__m?


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a

100 

b

200 

c

250 

d

300 

answer is C.

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Detailed Solution

A train 50 m long passes over a bridge at a velocity of 30 km/h. If it takes 36 s to cross the bridge, the length of the bridge would be 250 m.
Velocity (v)  = 30 km/h
  = 30×518
  = 8.3 m/s
Time taken to cross the bridge = 36 s
Let the length of the bridge be L.
Distance covered by train to cross (d) = 50+L
So, L+50=36×8.3
Therefore, L=250 m
 
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