#### Answer

2 weeks.

#### Work Step by Step

336 hr = wk
Use the unit fraction $\frac{1 day}{24 hours}$ to change hours to days and the unit fraction $\frac{1 week}{7 days}$ to change days to week. Notice how all the units divide out except week, which is the unit you want in the answer.
336 hr * $\frac{1 day}{24 hours}$ * $\frac{1 week}{7 days}$= 2 weeks.