Answer
Answer: $a.$ Less than 25 hours
Work Step by Step
The reason is very simple:
If the second pipe can $alone$ fill the pond in 25 hours, any help from the first pipe will reduce the total time the pond is filled in.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 7 - Section 7.6 - Proportions and Problem Solving with Rational Equations - Vocabulary and Readiness Check - Page 536: 2
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