You can put this solution on YOUR website! how long would it take traveling 30mph for 6 miles in a car
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60 miles/hour = 1 mile/minute
so 30 mph = 1/2 mile/minute, or 2 minutes per mile
6 miles*2 minutes/mile = 12 minutes
Notice that the miles cancel. You can often spot when you're doing the wrong thing by keeping track of the units.
