Mike can assemble a computer table in 40 minutes and I can do it in 60 minutes.
If Mike works for 20 minutes before I join him, how long will it take us to finish?

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  1. He is half done.

    task= time*rate
    time= task/rate= 1/2 / (1/40+1/60)

    time= 1/2 * 120/(3+2)=60/5=12min

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