Question
A train can cross a pole in 24 seconds. While if the
train increased its speed by 50% then time taken by it to cross 234 metres long platform is 42 seconds. Find the time taken by the train to cross a 126 metre long tunnel.Solution
Let speed of train is ‘x’ m/s So, length of train = 24 × x = 24x metres And, 24x + 234 = 1.5 × x × 42 Or, 39x = 234 Or, x = 6 m/s So, length of train = 24 × 6 = 144 metres Desired time = (144 + 126)/6 = 45 seconds
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