Wow that's a hard one. Ummm....
Answer:
27,9
Step-by-step explanation:
x + y =36
x - y = 16
27 + 9 = 36
27 - 9 = 16
Saw A = 150 planks/30 seconds = 5 planks per second
Saw B = 130 planks/ 13 seconds = 10 planks per seconds
5 + 10 = 15 planks per second total
225 planks / 15 planks per second = 15 seconds
Answer: 15 seconds
Rise over run so it would be 5 over -2.5 ?? I could be wrong:((