Answer:
a. {(1,3), (1,4) ,(2,3), (2,4) }
b. {(1,4), (1,5), (2,4), (2,5)}
8it is 8 .......................
There are 8 parts in total by adding the ratio. Math 2/8×2.4=0.6 hr
Eng. 2/8×2.4=0.6 hr
Hist. 3/8×2.4=0.9hr
Social. 1/8×2.4=0.3 hr. Add them all will get 2.4