According to his GPS, it will take Lanny 1 hour to travel 40 miles. Which expression shows how to determine the speed in miles per hour?

Speed is calculated by dividing distance by time. Lanny travels 40 miles in 1 hour, so the expression is 40 miles ÷ 1 hour. This gives a speed of 40 miles per hour, making “40 miles ÷ 1 hour” the correct choice.

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