Suddenly one day, you wake up to find that you are on a boat, which is at a exact center of a perfectly circular lake filled with piranhas. Moreover, at the shore of the lake stands a highly intelligent zombie, patiently waiting for you to reach the shore. Zombie cannot swim, and always runs slower than a you. But the problem is you cannot swim in the lake, and the boat is so slow that zombie can run on ground at 4 times the maximum speed of the boat in water. How do plan your escape such that when you reach the shore, the zombie is not there to catch you?