Posted by **Anil** on Friday, March 30, 2012 at 9:58pm.

A lawn sprinkler covers a rectangular pattern of 20ft x 30ft.

If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area.

2)What are the units on the constant?

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