Answer:
Bob's can make one burger in 0.3 minutes, or 18 seconds.
Explanation:
Bob's can make 10 hamburgers in 3 minutes. To determine how long it takes Bob's to make a single hamburger, we divide the 3 minutes by the 10 hamburgers.
3/10 = 0.3 minutes
It takes him 0.3 minutes to make one burger.
We could go further and convert this time to seconds. To do this, we multiply 0.3 minutes by 60 seconds.
0.3 ⋅ 60 = 18 seconds
Bob's can make one hamburger in 18 seconds.