20. A bicycle wheel makes 5000 revo...
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20. A bicycle wheel makes 5000 revolutions in moving 11 km. The diameter of the wheel is (1) 50 cm (2) 60 cm (3) 70 cm (4) 80 cm

11th - 12th Class
Maths
Solution
216
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Distance covered in one revolution 20 [ =frac{11 times 1000 times 100}{5000}=220 mathrm{cm} ] circumference of the wheel ( =220 mathrm{cm} ) The diameter be ' ( d ) ' Let the [ pi d=220 ] Then, [ frac{22}{7} times d=220 ] ( Rightarrow ) [ d=frac{220 times 7}{22}=70 mathrm{cm} ]
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