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16 February, 21:34

Justine swims freestyle at a pace of 150 laps per hour. Justines freestyle speed is three times faster than her butterfly speed how fast does she swim breaststroke let b represent Justines butterfly speed in laps per hour and r represent justices breaststroke speed in laps per hour

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  1. 17 February, 01:18
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    Answer:her breaststroke speed is is 30 laps per hour

    Step-by-step explanation:

    Let b represent Justine's butterfly speed and

    Let r represent Justine's breaststroke speed.

    Justine swims freestyle at a pace of 150 laps per hour. Justine swims breaststroke 20 laps per hour slower than she swims butterfly. This means that

    r = b - 20

    If Justine's freestyle speed is three times faster than her butterfly speed, it means that

    3b = 150

    b = 150/3 = 50

    Substituting b = 50 into r = b - 20, it becomes

    r = 50 - 20 = 30
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