# 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:

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

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