Answer: 2 hours
Step-by-step explanation:
Given: The total number of trees need to plant = 50
In 8 hours , the number of trees planted = 40
The rate of trees planted is given by :-
[tex]r=\frac{\text{number of trees}}{\text{hours}}\\\Rightarrow\ r=\frac{40}{8}=5[/tex]
Hence, they are planting 5 trees in one hour.
So if they planted 40 trees, the remaining trees=50-40=10
The number of hours taken by crew to plant them =[tex]\frac{10}{5}=2\ hours[/tex]
The total time taken by the crew to complete the work =8+2=10 hours
