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Today, 09:58

Alicia can paint a small room 21 hours faster than Nina aloneness 4 hours slower than Alicia and Nina together. How long will it take them to paint the room together? Express your answer in decimal form

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  1. Today, 10:17
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    11.413 Hours.

    Step-by-step explanation:

    Alicia can paint a house in 21 hours; Which means in 1 hour she can paint 1/24 of the house.

    Nina can paint the same house in (21+4) hours. Which means in 1 hour she can paint 1/25 of the house.

    Together in 1 hour they can paint: 1/21 + 1/25 = 46/525 of the house.

    Total Hours for painting the house together will be 525/46 = 11.413 Hours.
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