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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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9 votes
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?

User Nirav Bhatia
by
4.5k points

1 Answer

4 votes

Answer:

72 minutes

Explanation:

in minutes,

1/90 + 1/x = 1/40

x = 72

User Muthu Ram
by
4.2k points
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