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14-06-2022
Mathematics

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A girl can do her homework in 1.5 hours. How long would It take her twin brother to do the same homework alone if together they do it in 40 minutes?

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14-06-2022

Answer:

72 minutes

Step-by-step explanation:

in minutes,

1/90 + 1/x = 1/40

x = 72

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