Joe walks 3 miles east and then 1/2 mile west. It took him an hour, what was his average speed?
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This is a lowest common multiple question.
to find the lowest common multiple, you need to find the prime factors of the two numbers:
Take out duplicates:
and multiply them together:
and that is your answer.
Easy peasy.
to find the lowest common multiple, you need to find the prime factors of the two numbers:
Take out duplicates:
and multiply them together:
and that is your answer.
Easy peasy.