Respuesta :
Answer:
12 seconds.
Step-by-step explanation:
If you put it like 15/9 = 20/x, then cross multiply and divide you do 9 times 20 you get 180, then you divide 180 by 15 and you get 12. Hope this helps!
5 feet per sec so that means 3 sec for 5 feet so for 20 it’s 12 seconds