Answer:
5.2 minutes for 4 costomers.
Step-by-step explanation:
12/9=1.333 (3 repeating)
1.3 x 4 = 5.2
1it is 10 because 4/2= 2 and 2*5=10
The answer will be like this
X =20
Here are the 3 answers you needed :)!!!