Question : A train of length 342 m is running at 54 km/hr. In how much time (in seconds) will it cross a bridge of length 438 m?
Option 1: 48
Option 2: 50
Option 3: 54
Option 4: 52
Correct Answer: 52
Solution : Given: Speed of train = 54 km/hr = $54 \times \frac{5}{18}$ = 15 m/s Length of bridge = 438 m Total distance = train length + bridge length Total length = 342 + 438 = 780 So, the required time = $\frac{780}{15}$ = 52 sec Hence, the correct answer is 52.
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