Question

In the problem presented in the What's New section of this module, one pipe could ta
the pool in 12 hours while the other pipe could fill the same pool in 18 hours. You were asked
to find how long would it take to completely fill the pool if both pipes were used. Explain why
each of the following approaches is INCORRECT.
1. The time it would take to fill the pool is the sum of the lengths of time it takes each pipe to
fill the pool:
12 hours + 18 hours = 30 hours
2. The time it would take to fill the pool is the difference in the lengths of time it takes each
pipe to fill the pool:
18 hours - 12 hours = 6 hours
3. The time it would take to fill the pool is the average of the lengths of time it takes each
pipe to fill the pool:
12 hours + 18 hours 30 hours
= 15 hours
2
2​

Answer 1

Answer:

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