# 6 Pipes

6 Pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only five pipes of the same type are used? Give your answer in hours and minutes.

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### You need to know the following knowledge to solve this word math problem:

**solid geometry**- body volume
**basic functions**- inverse proportion
- direct proportionality
- simple proportion
**numbers**- fractions

### Units of physical quantities:

### Grade of the word problem:

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