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6 May, 09:08

Sarah left Minneapolis heading east on the interstate at a speed of 60mph. Her sister followed her on the same route, leaving 2 hours later and driving at a rate of 70mph. How long will it take for Sarah's sister to catch up to Sarah?

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Answers (2)
  1. 6 May, 09:12
    0
    12 hours

    Step-by-step explanation:

    Let 't' be the time (in hours) for Sarah's sister to catch up to Sarah.

    Sarah left Minneapolis (t + 2 hours) and covered = 60 (t + 2) miles

    Sarah's sister will cover the distance = 70 (t) miles

    Now make an equation

    70 (t) = 60 (t+2) (2 hours = 120 minutes)

    70t = 60t + 120

    70t - 60t = 120

    10t = 120

    t = 120/10 = 12 hours

    It would take 12 hours for Sarah's sister to catch up to Sarah.
  2. 6 May, 09:35
    0
    14 hours from Sarah's perspective and 12 hours from Sarah's sister's perspective
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