In the equation P=kVt3, where P, V, and t are pressure, volume, and temperature of gases in a chamber, and k is a positive constant, what is the work done by 5 moles of hot gases when the temperature is raised from 500 K to 550 K?

(a) 0 J
(b) Positive value
(c) Negative value
(d) Cannot be determined from the given information