Sam Walks and Rides...Math brain teasers require computations to solve.
Sam walks to her best friend's house at 2 miles per hour. She eats lunch there for 1 hour and then borrows a bike and rides home 5 times faster than she could walk. There are 10 miles between the two houses. What time must Sam leave from her house in the morning to be back by 4:00 p.m.?
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