Instead of carrying a full-size spare tire, many automobiles are equipped with a significantly smaller spare tire

Question:

Instead of carrying a full-size spare tire, many automobiles are equipped with a significantly smaller spare tire with a warning that the car should not exceed a speed of 50 mi/h.

(a) How much pressure does the smaller tire withstand if it must support one-fourth of a 1650-kg minivan and its area of contact with the road measures 8.26 cm x15.9 cm?

(b) Find the pressure on a full-size spare tire if its area of contact with the road measures 15.2 cm x 21.0 cm.