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Naily [24]
3 years ago
11

Following a severe​ snowstorm, Ken and Bettina Reeves must clear their driveway and sidewalk. Ken can clear the snow by himself

in 2 ​hours, and Bettina can clear the snow by herself in 5 hours. After Bettina has been working for 1-hour, Ken is able to join her. How much longer will it take them working together to remove the rest of the​ snow?
Mathematics
1 answer:
Mademuasel [1]3 years ago
6 0

Answer:

It will take 5.6 hours

Step-by-step explanation:

If Ken (K) can clear in two hours and bettina (B) in five hours then;

5K=2B; If B=1 K=2/5 = 0.4 (2-0.4=1.6) plus 4 from B are 5.6 or also: If B=4 (Bettina started 1 hour later 5-1=4) K=8/5=1.6 then K+B=1.6+4=5.6 h

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Answer:  

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Step-by-step explanation:

Concentration            Amount of             Amount

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    15%                                x                         0.15x

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0.15(40 - y) + 0.33y = 0.21•40

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