To divide a fraction by another,you flip the one you are dividing by to get the reciprocal and then multiply

5/8 '/. 2/3 = 5/8 x 3/2

5 x 3 = 15

8 x 2 = 16

therefore 15/16 which = 0.9375

However 5/8 = 0.625

Divide this by 3 and you get 5/24

so x2 and you get 10/24

10/24 /= 15/16