SOLUTION: Joan can shovel a certain driveway in 50 minutes. If Mary can shovel the same driveway in 20 minutes, how long will it take them, to the nearest minute, to shovel the driveway if

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Question 397455: Joan can shovel a certain driveway in 50 minutes. If Mary can shovel the same driveway in 20 minutes, how long will it take them, to the nearest minute, to shovel the driveway if they work together.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Let x represent the minutes it takes together to shovel the driveway

question states***per minute being the equalizer

  1/50 + 1/20 = 1/x  |Multiplying thru with 100x so as all denominators= 1

  2x + 5x = 100

     7x = 100

      x = 100/7 = 14.2857 min