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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