Solve the Problem $\frac { 6 } { 5 } \mathrm { hr }$

Multiple Choice

Solve the problem.
-Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 3 hours. How long will it take them to do the job if they work together?

A) $\frac { 6 } { 5 } \mathrm { hr }$
B) $6 \mathrm { hr }$
C) $\frac { 5 } { 6 } \mathrm { hr }$
D) $3 \mathrm { hr }$