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. 3x 4 2. r+ 3 2x 1 3. 4 2x 3 2x 4. x+ 4 3 3 5. - 3 2x + +
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. 3x 4 2. r+ 3 2x 1 3. 4 2x 3 2x 4. x+ 4 3 3 5. - 3 2x + +
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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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