Both apple trees will be 10 feet wide at maturity so they will be 2*10 = <<10*2=20>>20 feet wide
Quinton will need to leave 12 feet between these 2 trees so the apple trees will take up 20+12 = 32 feet
Both peach trees will be 12 feet wide at maturity so they will be 2*12 = <<12*2=24>>24 feet wide
Quinton will need to leave 15 feet between these 2 trees so the peach trees will take up 24+15 = 39 feet
Together, the apple trees will take up 32 feet and the peach trees will take up 39 feet so they will take 32+39 = <<32+39=71>>71 feet
#### 71