The numbers of hours(h) needed to solve a given problem set varies directly as the number of items (I) and inversely as the number of students (s) working on it. It takes 4 hours for the 2 students to solve 20 problem. a.What are the given in the problem: h=_____;I=______;s=________ b.Write the required equation: h=____________ c.How many hours will it take 4 students to solve 50 problems?​