Question
A train of length 300 metres crosses a man standing on
platform in 15 seconds. If its speed decreases by 20%, then find the time taken by train to cross a platform of length 420 metres.Solution
Speed of train = (300 ÷ 15) = 20 m/s New speed of train = 0.8 × 20 = 16 m/s Required time = (300 + 420) ÷ 16
= 720 ÷ 16
= 45 seconds
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