Question

The number of revolutions made by a bicycle wheel of 28-inch diameter in travelling 1/2 mile is closest to
a.720
b.180
c.360
d.120

Answer 1

(5280 * 12 / 2) / (π * 28) = ?

Answer 2

Dia. = 28 in. = 2.33 Ft.
1/2 mi. = 5280/2 = 2640 Ft.

1 Rev = pi*2r = 3.14*2.33 = 7.32 Ft.
2640Ft * 1Rev/7.32Ft = 360.6 Rev.