24. If a wheel covers a distance of 440 m in 20 rotations. Then, the diameter of the wheel is T = (1) 3.5 m (3) 14 m (2) 7 m (4) 21 m

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24. ( (2) because 2 pi r=1 ) rotation ( 2 pi r times 20=20 ) rotations ( Rightarrow quad 2 times frac{22}{7} times r times 20=440 ) ( Rightarrow ) ( r=frac{7}{2} ) Hence, diameter ( =2 times frac{7}{2}=7 mathrm{m} )

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