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A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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
Transcribed Image Text:Two pipes are used to pump a cement mixture out of a truck. The pipes work at the same rate.
When pipe A works alone it can empty the truck in 45 minutes. When both pipes are used together
they empty the truck in of the time that it takes pipe B to empty the truck when it works alone.
Suppose pipe B takes r hours to empty the truck when it works alone. Which one of the following
equations can be used to find x?
1
4
1.
- +
3
%|
3x
4
2. x +
3
3
2x
4
3. -+
3
1
2x
3
3
4. r+
4
2x
3
1
5.
3
3
2x
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