Question
Train A running with a sped of 90 km/h crosses a
vertical pole in 12 seconds. Speed of train A is 5 m/s less than speed of train B, and length of train B is 88 metres less than length of train A. Find the time taken by train B to cross a 202 metre long tunnel.Solution
Speed of train A = 90 × 5/18 = 25 m/s Speed of train B = 30 m/s Length of train A = 12 × 25 = 300 metres Length of train B = 300 – 88 = 212 metres Desired time = (212 + 202)/30 = 13.8 seconds
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