This could be one of two things, I need a bit more information, but perhaps you can decide.
Drip irrigation otherwise called trickle irrigation delivers water using tubes and emitters to the base of the plant. Subsurface irrigation uses a combination of tubes and emitters and is buried under ground. Good luck
It would take 15 trips. 90 divided by 6 is 15. Take that 15 and divide 225 which leaves you with 15
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