Dominique can ice cupcakes twice as fast as houston. when they work together, dominique and houston can ice a large order of cupcakes in 5 hours. how many hours would it take houston to ice them by himself?
1
4
thirteen-halves
fifteen-halves

This is a work problem. It can be solved as follows:

Houston = 1/x
Dominique = (1/2x)
Together = 1/5

Then, we add Houston and Dominique:

1/x + 1/2x = 1/5

Solve for x,

x = 2/15

Therefore, it would take 15/2 hours for Houston to ice by himself, the last option.