The Total Hours for a Private Pilot, Single Engine Land $\frac { 9 } { 34 }$

The total hours for a Private pilot, single engine land rating for a single engine airplane is 90 h of flight time. The total hours of flight time for a Commercial rating is 340 h. What is the ratio of the hours for a Private rating to the hours for a Commercial rating?

A) $\frac { 9 } { 34 }$
B) $\frac { 15 } { 40 }$
C) $\frac { 13 } { 30 }$
D) $\frac { 7 } { 32 }$
E) $\frac { 34 } { 9 }$