# Bicycle wheel

A bicycle wheel has a diameter of 60 cm. Approximately how many times does wheel rotate at 2.5 km long trip?

Result

N =  1326

#### Solution:

$d = 60 \ cm = 60 / 100 \ m = 0.6 \ m \ \\ o = \pi \cdot \ d = 3.1416 \cdot \ 0.6 \doteq 1.885 \ m \ \\ s = 2.5 \ km = 2.5 \cdot \ 1000 \ m = 2500 \ m \ \\ \ \\ N = s/o = 2500/1.885 \doteq 1326.2912 = 1326$

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