Decide What Values of the Variable Cannot Possibly Be Solutions $\frac { 1 } { 15 } \mathrm { hr }$

Multiple Choice

Decide what values of the variable cannot possibly be solutions for the equation.
-One maid can clean the house in 5 hours. Another maid can do the job in 3 hours. How long will it take them to do the job working together?

A) $\frac { 1 } { 15 } \mathrm { hr }$
B) $\frac { 15 } { 8 } \mathrm { hr }$
C) $\frac { 15 } { 2 } \mathrm { hr }$
D) $\frac { 1 } { 8 } \mathrm { hr }$