Question
A train of length 360 metres crosses a man standing on
a platform in 12 seconds. If its speed decreases by 25%, then find the time taken by the train to cross a platform of length 540 metres.Solution
Speed of train = (360 ÷ 12) = 30 m/s New speed of train = 0.75 × 30 = 22.5 m/s Required time = (360 + 540) ÷ 22.5
= 900 ÷ 22.5
= 40 seconds
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