A Boat with an Anchor on the Bottom at a Depth

Short Answer

A boat with an anchor on the bottom at a depth of $30.0 \mathrm{~m}$ is drifting away from the anchor at $3.00 \mathrm{~m} / \mathrm{s}$ , while the anchor cable slips out at water level. At what rate is the cable leaving the boat when the boat has drifted $10.0 \mathrm{~m}$ away from the spot directly above the anchor? Assume that the cable is straight.