Diameter of car tire = 14 inches

Radius of car tire = 7 inches = 7*2.54 cm = 17.8 cm

Circumference of the car tire = 2*pi * 17.8 = 2 *3.14 *17.8= 111.78 cm

Distance traveled by car = .5 mile = .5 *1.6 km = .8 km = 800 m = 8 * 10^4 cm

Number of revolutions =Distance traveled / Circumference of tire = 8 * 10^4 / 111.78 = 715.6

Since the answer choices are far apart we should use estimation in this question .

Ideally ,in the GMAT the conversion between units would be provided .

Answer D

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