You must leave for campus in half an hour, or you will be late for class. Unfortunately

Chapter 6, Problem 38

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You must leave for campus in half an hour, or you will be late for class. Unfortunately, you are snowed in. You can shovel the driveway in 45 minutes and your brother claims he can do it in 36 minutes. If you shovel together, how long will it take to clear the driveway? Will this give you enough time before you have to leave?

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