Could you please help me find the formula and step by step directions to the answer?

The titanium shell of an SR-71 airplane would expand when flying at a speed exceeding 3 times the speed of sound. If the skin of the plane is 400 degrees C and the linear coefficient of expansion for titanium is 5x10 -6 /C when flying at 3 times the speed of sound, how much would a 10-meter long (originally at OC) rod portion (1- dimension) of the airplane expand? Write your final answer in centimeters and show all of your work