A 120 metre long train running at 40 km/h will cross a bridge 80 m long in
A 120 metre long train running at 40 km/h will cross a bridge 80 m long in
A15 seconds
B18 seconds
C13 seconds
D20 seconds
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Answer is : 18 seconds
Total Distance = Train length + bridge distance
= 120 metre + 80 metre
= 200 metre.
Speed Of Train = 40 km/h
\(=\frac{(40*1000)}{(60 *60)} m/s\)
Time To Cross a bridge = \((distance)\over(time)\)=\(\frac{\frac{200}{ (40*1000)}}{(60 *60)}\)
\(=\frac{(200 * 60 * 60)}{(40 * 1000)}\)
= 18s
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