Respuesta :

Answer:

28 seconds

Step-by-step explanation:

You divide 18/8 to get 2.25. Then you divide 63 and 2.25 to get 28.

Answer:

28 seconds.

Step-by-step explanation:

Let's use a ratio:

words : seconds

   18    :       8

    9    :        4

   63   :       28