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Posted by on Tuesday, April 2, 2013 at 9:51pm.

Jack usually mows his lawn in 3 hours. Marilyn can mow the same yard in 5 hours. How long would it take them to mow the lawn together?

  • MATH - , Tuesday, April 2, 2013 at 10:12pm

    Jack's rate alone = 1/3
    Marilyn's rate = 1/5
    combined rate = 1/3 + 1/5 = 8/15

    time at combined rate = 1/(8/15) = 15/8 = 1.875 hrs
    or 1 hour and appr 53 minutes

  • MATH - , Sunday, November 8, 2015 at 2:41pm

    4 hours

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