a student clearing snow

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Question description

a student must leave for campus in 10 minutes or he will be late for class.  unfortunately, he is snowed in.  he can shovel the driveway in 20 minutes, and his brother claims to be able to do it in 14 minutes.  if they shovel together, how long will it take to clear the driveway

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(Top Tutor) Daniel C.
School: Rice University
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