10.Silvana must knit a blanket in 9 days. Knitting 8 hours a day, at the end of the fifth day, only 2/5 of the blanket was done. To be able to finish on time, how many hours will Silvana have to knit per day?

Use the formula for the total accomplishment, as written below. $$ A=nrt $$ Where A is the total accomplishment by n number of workers at time t, r is the rate of work done. As given, $$ \frac{2}{5}=1\times r\times5\left(8\right), $$ $$ r=\frac{1}{100} $$ Now, find the number of hours Silvana has to knit per day to finish the blanket on time. $$ 1-\frac{2}{5}=1\times\frac{1}{100}\times\left(9-5\right)h, $$ $$ h=15 $$ So, Silvana has to knit 15 hours per day to finish the blanket on time.