SOLUTION: Sally takes 4 hours to paint a room. harry takes 6 hours how long for both of them to paint one room? which is 2.42 hours for botn of them together
can you please show me the form
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can you please show me the form
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Question 99700: Sally takes 4 hours to paint a room. harry takes 6 hours how long for both of them to paint one room? which is 2.42 hours for botn of them together
can you please show me the formula how this answer was derived thankyou Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! Sally takes 4 hours to paint a room. harry takes 6 hours how long for both of them to paint one room? which is 2.42 hours for both of them together
can you please show me the formula how this answer was derived>
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Here is a simple method to do these kind of problems
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Let x = time required when working together
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Let the completed job = 1
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That means each one will do a fraction of the job and the two fractions = 1
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J's fraction + H's fraction = completed job + = 1
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Multiply the equation by 12, to get rid of the denominators:
12* + 12* = 12(1)
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Cancel out the denominators, and you have a simple equation:
3x + 2x = 12
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5x = 12
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x = 12/5
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x = 2.4 hrs, (not sure why you have 2.42 hrs as the answer)
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Check our solution in the original equation: + = 1
.6 + .4 = 1
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