Question
A 300-metre-long train takes 12 seconds to cross a pole.
Due to engine fault, the speed is reduced by 20%. Find the time taken by the train to cross a platform of length 600 metres.Solution
Speed of the train = 300 / 12 = 25 m/s
New speed = 0.8 × 25 = 20 m/s
Required time = (300 + 600) ÷ 20 = 900 ÷ 20 = 45 seconds
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