Answer:
40 hrs
Step-by-step explanation:
-Given that 10% of the work is done in 4 hrs.
-Determine how many 10% portions make up 100%
[tex]=\frac{100\%}{10\%}\\\\=10[/tex]
-Given that the work rate is remains unchanged for the entire work period.
#We multiply the number of hours per portion by the total number of portions:
[tex]t=hrs\times portions\\\\=4\times 10\\\\=\ 40\ hrs[/tex]
Hence, it will take 40 hrs to finish the job.
