Answer:
4
Step-by-step explanation:
Joe completes an average of (10 ft)/(5 h) = 2 ft/hour. Bill completes an average of (10 ft)/(4 h) = 2.5 ft/hour. Together, they complete 2+2.5 = 4.5 ft/hour. At that rate, it will take them
... (120 ft)/(4.5 ft/h) = 26 2/3 h
Answer:
4
Step-by-step explanation:

{L'Hospital's rule}
<em>I hope this helps you</em>
<em>:)</em>
9=5 -y/3
-5
3=-y/3
cross multiply
1=-y
y=-1