Beginning at 8: 30 a. m., tours of the national captiol and the white house begin. the national capitol leave every 15 minutes, and the white house leave every 20 minutes. how often do the tours leave at the same time

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )