Respuesta :
5 hours. 15 miles divided by ( 3 x 1 ) = 5. Since you only get 3 kilometers per hours, you divide it, or you can do cross multiply :).
Answer:
5
Step-by-step explanation:
i think it's 5 if you do 15 divided by 3 = 5 and if u count the km and hours it goes to 5
3 km 1 hr
6 km 2 hr
9 km 3 hr
12 km 4 hr
15 km 5 hr
hope this helps <33