If 'V' is vehicle speed (in metres/min) and 'R' is radius of driving wheel (in metres) then the rpm of the driving wheel is given by
A. $$rpm = {V \over {2\pi R}}$$
B. $$rpm = {{2\pi V} \over R}$$
C. $$rpm = {{\pi R} \over V}$$
D. $$rpm = {{\pi V} \over R}$$
Answer: Option A
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