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Billy likes to go cycling. His bike has wheels of diameter 80cm He has invented a counter for his bike, which counts the number of revolutions the...

Billy likes to go cycling.
His bike has wheels of diameter 80cm
He has invented a counter for his bike, which counts the number of revolutions the wheels make.
One day the counter shows 320 revolutions
How far has Billy cycled?
Give your answer to the nearest metre

Please help!
Thanks

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