# Math

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If a tire rotates at 150 revs/min when the truck is travelling 40km/h, what is the circumference of the tire?
4.44 meters

• Math -

40km/hr = 40/60 km/min = 40000/60 m/min

40000/60m/min / 150rev/min = 40000/9000 m/rev = 40/9 m/rev = 4.44 m/rev

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