Question : The length of a train is 330 metres and it is moving at the speed of 72 km/hr. In how much time will it take to cross a platform of length 710 metres?
Option 1: 52 seconds
Option 2: 56 seconds
Option 3: 72 seconds
Option 4: 64 seconds
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Correct Answer: 52 seconds
Solution : Given: The length of a train is 330 metres and it is moving at the speed of 72 km/hr. The platform's length = 710 metres. Distance = Speed × Time The total distance = Length of the train + Length of the platform = 330 + 710 = 1040 m The speed of the train = 72 km/hr. Convert km/hr into m/s by multiplying with $\frac{5}{18}$, ⇒ 72 km/hr = 72 × $\frac{5}{18}$ = 20 m/s The time required by the train to cross a platform = $\frac{1040}{20}$ = 52 seconds Hence, the correct answer is 52 seconds.
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