Math

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Jane walks one mile from her house to her grandparents’ house. Then
she returns home, walking with her grandfather. Her return rate is 70% of her normal walking rate. Let r represent her normal walking rate.

a. Write an expression for the amount of time Jane spends walking.
b. Simplify your expression.

  • Math -

    since time = distance / speed,

    t =1/r + 1/.70r = 1.70/.70r = 2.43/r or 17 / 7r

  • Math -

    How did it add up to 1.7/.7r?

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