1. The problem statement, all variables and given/known data Airplane flies over route in shape of triangle ABCD. Time(t1, t2, t3) of flying over sections AB, BC, CA are known. Lenght of sections is also known. During fly wind is present. velocity of wind is constant, and speed of airplane relative to wind is also constant. Find velocity of airplane and velocity of wind. 2. Relevant equations 3. The attempt at a solution I dont understand this problem. I can get velocity of airplane from |AB|/t1 There is no relation between velocity of airplane and velocity of air, and air can have any constant velocity. Why am i wrong?