What is the length of the line?

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,