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20 July, 20:07

Jin and Chen are painting a fence. Each plank in the face takes one person about 3 minutes to paint. If there are 8 sections of fence with 12 planks in each section, about how many hours will it take Jin and Chen to do the job?

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  1. 20 July, 22:46
    0
    First find how many planks there are:

    8 sections x 12 planks per section = 96 total planks.

    If 1 person can do 1 plank in 3 minutes, then 2 people can do 2 planks in 3 minutes.

    96 planks : 2 planks = 48 sections of 3 minutes.

    48 x 3 = 144 minutes

    144 : 60 = 2 hours 24 minutes
  2. 20 July, 23:06
    0
    Multiply 8 by 12 then multiply the answer by 3
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