In a seminar scheduled from $10:00 \mathrm{am}$ to $2:30 \mathrm{pm}$, there are two breaks. The first tea break from $11:00 \mathrm{am}$ to $11:15$ am and the second is the lunch break from $1:00$ pm to $1:30$ pm. Find the ratio of the break time to the total duration of the seminar.