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Math Help - Rates, and minutes

  1. #1
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    Rates, and minutes

    Jon is given some money by his mother to pick up some milk at a local store. He walks slowly to the store at a rate of 3 km/h for 15 minutes, takes 5 minutes to buy the milk, and then runs home at a rate of 5 km/h. Create a graph to present this information and use the graph to determine how long the whole trip took.

    I just need help solving the bolded part. What formula am I supposed to use to figure how long he made it back home at 5 km/h?

    Rise
    ____ ?
    Run
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  2. #2
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    Quote Originally Posted by Ivory View Post
    Jon is given some money by his mother to pick up some milk at a local store. He walks slowly to the store at a rate of 3 km/h for 15 minutes, takes 5 minutes to buy the milk, and then runs home at a rate of 5 km/h. Create a graph to present this information and use the graph to determine how long the whole trip took.

    I just need help solving the bolded part. What formula am I supposed to use to figure how long he made it back home at 5 km/h?

    Rise
    ____ ?
    Run
    Hi

    "He walks slowly to the store at a rate of 3 km/h for 15 minutes" => this means that the distance between his home and the store is 3km/h x 1/4h = 0,750 km

    "runs home at a rate of 5 km/h
    " => this means that he ran back home in 0,750km / 5km/h = 0.15 h = 9 minutes
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