a train 270m long is running at 80km/hr. how much time will be take to cross a bridge 130m long
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Answered by
11
Speed of the train = 80 km/hr = 80 x 1000/3600 80 x 5/18 = 200/9 m/sec
Distance = length of the trian + length of the platform = 130 m + 270 m = 400 m
Time = Distance / Speed
= 400x9 / 200
= 2 x 9
= 18 sec.
Answered by
2
SO WE HAVE TO FIND THE TIME THAT THE TRAIN TAKES TO CROSS THE BRIDGE:
80km/hr. = 22.2m/s
here we can find the answer simply by using velocity formula which is
⇒ v = distance/time
but the logic here is that the train completely passes the bridge only when the last tip of its last compartment is out. so we have to take the total distance as:
Length of bridge+ Length of train
= 270+130=400m
so the time taken is;
22.2 = 400/t
t= 18.01 sec
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