timia618
Pump 1 can empty a pool in 9 hours while Pump 2 can empty the same pool in 12 hours. If the two pumps worked together, how long would it take them to empty the pool?
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timia618
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Solve the following inequality: 2x + 6 ≤ 5x - 9
estudier
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Pump 1 does 1/9 per hour and Pump 2 does 1/12 per hour
timia618
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how many hours then together?
estudier
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Work out how much the two are doing per hour together and u can easily get your answer...
timia618
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about 5 hours
about 5 hours and 10 minutes
about 5 hours and 20 minutes
about 5 hours and 30 minutes ?
Algebraic!
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\[\frac{ 1pool }{ 9 hours }*T hours + \frac{ 1pool }{ 12 hours}*Thours = 1 pool\]
t/9 + t/12 =1
Algebraic!
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solve for t
timia618
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5 hours?
Algebraic!
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you solved for t and got t=5?
timia618
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idk
timia618
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how do i get the t?
Algebraic!
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multiply the whole equation by (9*12)
timia618
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108
Algebraic!
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yes, multiply the whole equation by 108
Algebraic!
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it will be easier for you if you leave 108 as 9*12 , but do it however you like...
timia618
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so the answerr is 5hr and 30mns
Algebraic!
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what did you get for t?
timia618
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A plane traveling from Dallas to New York with a tailwind of 30 miles per hour takes 4.5 hours. Returning with the headwind, it takes the same plane 5 hours. What is the average speed of the plane in calm conditions?
A plane traveling from Dallas to New York with a tailwind of 30 miles per hour takes 4.5 hours. Returning with the headwind, it takes the same plane 5 hours. What is the average speed of the plane in calm conditions?
anonymous
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go right to the answer, no agony
\[\frac{9\times 12}{9+12}\]
timia618
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so its 9
anonymous
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i seriously doubt
\[\frac{9\times 12}{9+12}=9\]
timia618
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i got 5.1428567143
timia618
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so the answer is 5hrs?