It Takes a Grounds Keeper 45 Minutes to Prepare a Softball

Multiple Choice

It takes a grounds keeper 45 minutes to prepare a softball field for a game. It takes his assistant 65 minutes to prepare the same field. How long will it take if they work together to prepare the field?

A) $24 \frac { 13 } { 22 } \mathrm {~min}$
B) $26 \frac { 13 } { 21 } \mathrm {~min}$
C) $25 \frac { 13 } { 22 } \mathrm {~min}$
D) $26 \frac { 13 } { 22 } \mathrm {~min}$
E) $26 \frac { 15 } { 22 } \mathrm {~min}$