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itsjustcruel's avatar

Help with this maths question?

Asked by itsjustcruel (387 points ) November 29th, 2011

I don’t want the answer, I would just like to know how I go about working this out as I have forgotten:
Billy likes to go cycling, his bike wheels have a diameter of 90cm.
Billy counts the number of revelations the wheel makes. It makes 140 revolutions, how far has Billy cycled? Give your answer to the nearest metre.

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5 Answers

Mariah's avatar

In one rotation, he travels a distance equal to the circumference of his wheel. Do you know how to calculate circumference given the information you have?

itsjustcruel's avatar

@Mariah Yes thanks, I kept forgetting that part :)

Mariah's avatar

Okay, cool! It helps if you picture the wheels having paint on them and leaving a line behind him. You can picture better the relationship between circumference and distance traveled that way.

machi's avatar

Billy likes to go cycling, his bike wheels have a diameter of 90cm.
Billy counts the number of revelations the wheel makes. It makes 140 revolutions, how far has Billy cycled? Give your answer to the nearest metre

itsjustcruel's avatar

Sorry what?

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