An airplane is flying at a speed of 400 mi/h at an altitude of one mile. The plane passes directly above a radar station at time t = 0. 1 mi (a) Express the distance s (In miles) between the plane and the radar station as a function of the horizontal distance d (in miles) that the plane has flown. s(d) = (b) Express d (in miles) as a function of the time t (in hours) that the plane has flown. d( ) = (c) Use composition to express s as a function of t. s(!) =