Train ‘A’ travelling with a speed of 84 km/h can cross a pole in 12 seconds. If the length of train ‘B’ is 20% less than that of train ‘A’ and it can cross a pole in 21 seconds then speed (in km/h) of train ‘B’ is:
Speed of train ‘A’ = 84 × (5/18) = (70/3) m/s Length of train ‘A’ = (70/3) × 12 = 280 metres Length of train ‘B’ = 0.4 × 280 = 224 metres Speed of train ‘B’ = (224/21) × (18/5) = 38.4 km/h
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