Question 3675
It is a good idea to convert your fractions to a more workable form:

3 5/8 = 29/8

2 1/2 = 5/2  

1/2(29/8  *    5/2)  = 1/2 (145/ 16) =  145/32 

This works out to 4 and 17/32, our answer. 

cleomenius