22 points question! A wheel is of diameter 70 cm. If it makes 500 revolutions in 5 minutes, find its speed in km/h.​

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1. Since the diameter of the wheel is 70m, its radius is 35m.

   In one revolution, the wheel covers the distance of one circumference.

   Circumference of the wheel of radius 35m

   =2×22/7×35

   =220m

   Distance travelled in 500 revolutions =500×220m

   =110000m

   Speed = Time/Distance

   = 110000m/5 min

   = 110000/5×60seconds

   =18/3 m/s

   m/s can be converted to km/hr using the formula m/s ×3.6= km\hr

   Now, 18/3×3.6=13.2km/hr

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