I'm terrible at math, so I'm sorry if I'm totally wrong, but I'm assuming you just take the average:
20+28=48m
48/2=24m
On average, it may take them 24m if they work together.
I believe the answer is D but i could be wrong. sry for not being absolutely sure.
lol
Answer:
hope this helps
Step-by-step explanation:do not need one really
Answer:
18
Step-by-step explanation: