Solve
-A Painter Can Finish Painting a House in 8 $\frac { 9 } { 40 } \mathrm { hr }$

Multiple Choice

Solve.
-A painter can finish painting a house in 8 hours. Her assistant takes 10 hours to finish the same job. How long would it take for them to complete the job if they were working together?

A) $\frac { 9 } { 40 } \mathrm { hr }$
B) $9 \mathrm { hr }$
C) $7 \mathrm { hr }$
D) $4 \frac { 4 } { 9 } \mathrm { hr }$