Michael Phelps comes to Canandaigua to train for the next Olympics. He starts at one shore and swims across the widest part of Canandaigua Lake, which is 2.4 km from one shore to the other. Though he intends to swim across the lake in a straight line, the current pushes him off course and he is 0.75 km away from where he intended to finish. What is the displacement from where he started to where he finished? Calculate your answer to two decimal places.