Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 7 - Section 7.1 - Ratio - Exercises - Page 271: 67


$8.\overline3\ hr$

Work Step by Step

Find the total number of drops. $2\ L\times\frac{1000\ mL}{1\ L}\times\frac{10\ drops}{1\ mL}=20000\ drops$ Divide the number of drops by the flow rate to find the time. $20000\ drops\div\frac{40/ drops}{1\ min}=20000\ drops\times\frac{1\ min}{40\ drops}=500\ min$ Convert to hours. $500\ min=500\ min\times\frac{1\ hr}{60\ min}=8.\overline3\ hr$
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