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At the speed of 60 km per hour, 125 meter long train crosses a bridge in 30 seconds. What is the length of bridge?1. 375 meter2. 225 meter3. 125 meter4. 250 meter |
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Answer» Correct Answer - Option 1 : 375 meter Given: Speed of the train = 60 km/h Length of the train = 125 m Time to cross a bridge = 30 sec Concept used: Distance = Speed × Time km/h × 5/18 = m/sec Calculation: Speed of the train = 60 km/h ⇒ 60 × 5/18 = 50/3 m/sec Let the length of a bridge be L. (125 + L)/(50/3) = 30 ⇒ (125 + L) = (30 × 50)/3 ⇒ 125 + L = 500 ⇒ L = 500 – 125 ⇒ L = 375 ∴ The length of bridge is 375 m. |
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