Asked by kudu

Two towns P and Q are 400 km apar. A bus left for P and Q. It stopped at Q for one hour and then started the return to P. one hour after the departure of the buse from P, a trail also heading for Q left P. the trailer meth the returning bus ¾ of the way from P to Q. they met t hours after the departure of the buse from from P.

(a) Epress the average speed of the trailer in terms of t
(b) Find the ration of the speed of the bus O that of the trailer