Question : A train travelling at 36 km/h crosses a pole in 25 seconds. How much time (in seconds) will it take to cross a bridge 350 m long?
Option 1: 72
Option 2: 48
Option 3: 60
Option 4: 56
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Correct Answer: 60
Solution :
Speed of train = $36 × \frac{5}{18}$
= 10 m/s
Time taken = 25 seconds
Length of train = 25 × 10
= 250 m
Length of bridge = 350 m
Total length = length of tran + length of bridge
Total length = 250 + 350
= 600 m
Time taken to cross the bridge = $\frac{600}{10}=60$
Hence, the correct answer is 60 seconds.
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