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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)
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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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
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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