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3.) One pump can fill a tank with oil in 4 hours. A second pump can fill the same tank in 3 hours. If both
pumps are used at the same time, how long will they take to fill the tank?

 Feb 10, 2019
 #1
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1/4  +   1/3 =1/T

1/T = 7/12        Take the reciprocal of both sides

T =12/7 =1 5/7 - hours =~ 1 hour and 43 minutes for both pumps to fill the tank.

 Feb 10, 2019
 #2
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Take the reciprocal: 1/3 + 1/4= 7/12. So, 12/7=1 5/7 hours. 

 Feb 10, 2019
 #3
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1/3 + 1/4  =  1/ Total Time Working Together

 

4/12  + 3/12 =  1 / T

 

7 /12  = 1 / T       [ remember that we can write ]

 

12 / 7  =  T / 1

 

12/ 7  = T     

 

T = 12/7 hrs ≈     1.7 hrs  =    1 + .7(60)  =   1 hr 42 min

 

Original Answer: https://web2.0calc.com/questions/4-sketch-a-graph-of-a-polynomial-that-would-have-help

Credit To: CPhill

 

-- 7H3_5H4D0W

 Feb 10, 2019
edited by GAMEMASTERX40  Feb 10, 2019

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