Question
A train can cross a pole in 30 seconds. While if the
train increased its speed by 55% then time taken by it to cross 351 metres long platform is 42 seconds. Find the time taken by the train to cross a 130 metre long tunnel.Solution
Let speed of train is ‘x’ m/s So, length of train = 30 × x = 30x metres And, 30x + 351 = 1.55 × x × 42 Or, 35.1x = 351 Or, x = 10 m/s So, length of train = 30 × 10 = 300 metres Desired time = (300 + 130)/10 = 43 seconds
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