Answer:
3 ft/sec
Explanation:
First, write down what you know. You should know that Iana walks 180 feet per minute.
180 ft/min
Second, apply the seconds to what you know. 60 seconds are in a minute, so you multiply 60 seconds by 1 minute.
= 180 ft/min x 60 (sec)
You are left with 180 ft/60 seconds. When you're dividing 180 by 60, ignore the units of measurement so you don't get confused.
= 180 ft/ 60 sec
After you divide 180 feet by 60 seconds, you should get...
= 3 ft/sec