Average response time in a specific month by project type


I'm a beginner user trying to get an advanced result and I could use some assistance. I have columns for Project Type, Start Date, and Response Time (among others incidental to this issue). I need a formula to return the average response time for all type 1 projects started in April. I seem to have worked my way into a quagmire with my formula to the point where I'm not even sure what I'm trying to ask the sheet to do. Any ideas would be much appreciated. Thanks.

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