A wheel completes 2000 revolutions to cover the 9.5 km distance. Then the diameter of the wheel is ?(A) 1.5 m(B) 1.5 cm(C) 7.5 cm (D) 7.5 m
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Explanation:
2000×2πr= 9.5 km
4000πr= 9.5×1000m
4πr= 9.5
πr= 2.375
r=2.375/3.14m
r= .75m
d= 2r
d= 2×.75
d= 1.5 m
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