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Together, Bob and Tom take 4 hours to get the yard work done. If Bob works alone, it takes him 6 hours. How long would it take Tom, working alone, to do all of the yard work? 10…
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Together, Bob and Tom take 4 hours to get the yard work done. If Bob works alone, it takes him 6 hours. How long would it take Tom, working alone, to do all of the yard work? 10…
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Oct 3, 2017
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Together, Bob and Tom take 4 hours to get the yard work done. If Bob works alone, it takes him 6 hours. How long would it take Tom, working alone, to do all of the yard work?
10 hours
12 hours
8 hours
9 hours
Mathematics
high-school
Matt Holmes
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Matt Holmes
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6
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Answer:
12 b
Explanation:
Chameleon
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Oct 4, 2017
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Chameleon
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The answer is 12 and let me tell you how can you get to that conclussion:
Let X be the number of hrs Tom takes to do it
Add their rates of working
( 1 yard ) / ( 6 hrs ) + ( 1 yard ) / ( X hrs ) = ( 1 yard ) / (4 hrs ) and then what you do is
1/6 + 1/x = 1/4
Remember to multiply both sides by 12x
then = 2x + 12 = 3x
Mrydengren
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Oct 9, 2017
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Mrydengren
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