a train 100 m long moving on a straight level pases a pole in 5 s find the time it will take to cross a bridge of 500 m long
Answers
Answer:
48km/hr
Explanation:
we know that
speed=distance/time
t1=d/2/40
=d/80
t2=d/2/60
=d/120
total time =t1+t2
=d/t1+t2
=d/d/80+d/120
=d/d*5/240 { d gets canceled and by taking reciprocal }
=240/5
=48km/hr
Answer:
Solution :
According to the given question , a train of 100m length moving on a straight level passes a pole in 5s.
Let us assume that the speed of the train is x m/s.
Speed = Distance/Time
> x = [ Length of train + width of pole]/Time
> x = 100/5 = 20 m/s.
So , we got to know that the speed of the train is 20 m/s.
Now we have to find the time it should take to cross a bridge of length 500m .
Total distance to be covered by the train :
> Length of train + length of bridge
> 100m + 500m
> 600 m .
Speed > 20 m/s .
Time taken to cover >> 600/20 >> 30s.
Answer - The train will take 30s to cross a bridge of length 500m .
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