Homework problem "Leaking faucet" Problem : Leonardo da Vinci constructed an apparatus consisting of two vertical boards hinged together on one side and covered with blotting paper on the inside faces. A leaking water tap lets drops fall down between the boards at presumable equal intervals of time. When a sting is suddenly pulled, the boards are clapped together and the position of the drops on the blotters can be inspected. Suppose that the vertical boards are 3 feet long and the leaking faucet is at such height and the rate of the dropping is so regulated that when a drop is just coming out of the faucet, the next or second drop is just at the top of the boards and the sixth drop is at the bottom of the boards, while drops 3, 4 and 5 are between the boards. Calculate the number of drops leaving the faucet per second. I'm stumped on this. I figured there is probably some simple approach I'm missing. But when I try to figure it out I always end up needing some other piece of information that I don't have and can't find out how to get ( like the distance from the faucet to the top of the boards). Any help would be greatly appreciated, thanks.