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9. A train is running at a speed of 48 km/h. How long will it take to reach a signal at a distance of80 metres from the starting platform?

Answer»

48km/h = 48×1000/3600 m/s = 48×5 /18 = 24×5/9 = 8×5/3 = 40/3 m/s.for 80m, time= 80÷40/3 = 80×3/40 = 6s



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