57 miles
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It is important to know how to calculate the speeds of objects. If a person is riding their bike at 15 miles per hours, they will travel 30 miles in 2 hours.
Three hours (30/10 = 3).
The speed is: 75/3 = 25 mph
A: 9 hours.
It depends on the distance travelled, If the person had travelled 120 miles the it would be 2 hours. Time = Distance/Speed