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A train passes a station that is 270 m long in 90 sec. at a speed of 108 km/hr. The time taken by the train to pass a bird feeder is:1. 45 seconds2. 60 seconds3. 81 seconds4. 55 seconds5. 90 seconds |
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Answer» Correct Answer - Option 3 : 81 seconds Given: Length of the station = 270 m Time taken on crossing the station = 90 sec Speed = 108 km/h Calculations: Speed of train = 108 km/h = 108 × 5/18 ⇒ 30 m/s Let the length of the train be x metres. Then, (x + 270)/30 = 90 ⇒ x + 270 = 90 × 30 ⇒ x + 270 = 2700 ⇒ x = 2430 So, time taken by the train to cross the bird feeder ⇒ 2430 /30 ⇒ 81 s The time taken by the train to cross the bird feeder is 81 seconds. |
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