Hi.
Just convert inches to feet.

You need first to convert feet to inch so 5 feet in 60 inch because 1 feet it's 12 inch so 5x12=60 (in metric system you need do divide 1 feet by 1 inch so 1feet=30.48cm 1inch=2.54cm so 30.48/2.54=12, now you moltiply 12 x 5 = 60). Than the task ask you what is the ratio of 5 feet to 30 inch so, you know that 5 feet is 60 inch, so the ratio of 60 inch to 30 inch is 60/30 = 2:1