# Jan takes #1.6# minutes to run a quarter of a mile. How long will he take to run #1# mile?

Running at a constant rate, will take 4 times as long.

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If you were to work out his actual speed in "minutes per mile" that will give you the time to run 1 mile.

("per" means for each, or for 1)

So treating this as a rate question, "minutes per mile" tells us what to divide by what.

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Jan takes 6.4 minutes to run 1 mile.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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