Based on the data provided in Table $2\mathrm{.}6,$ what is the flow time of customers from $9$:$00$ a$.$m$.$ to $10$:$00$ a$.$m$?$

Note: Round your answer to $1$ decimal place.

Customer Time in Time out

$19$:$019$:$08$

$29$:$049$:$14$

$39$:$099$:$27$

$49$:$109$:$28$

$59$:$159$:$33$

$69$:$159$:$41$

$79$:$199$:$29$

$89$:$219$:$49$

$99$:$229$:$51$

$109$:$239$:$46$

Need to answer: Flow time: $\_\_\_\_$ per min