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A bicycle wheel, diameter 70 cm, is making25 revolutions in 10 sec. At what speed in km/h isthe bicycle travelling? {ans-19.8km/hr} |
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Answer» 19.8 km/hr Step-by-step EXPLANATION: Diameter=70 CM PERIMETER of a circle is πd 22/7*70=220 cm Distance covered in 25 revolutions is 220*25 5500 cm in 10 sec Speed=Distance/Time taken Since the answer should be in km/hr, let us convert 5500 cm into metres 5500 cm=0.055 km and 10 sec =1/360 hrs 55/1000 / 1/360 55/1000*360 55*36/100 1980/100 19.8 km/hr |
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