A four

$-$

step process has processing

times of

$3$

$,$

$4$

$,$

$7$

$,$

$$and

$4$

$$minutes for

the four steps

$($

listed from start to

finish

$)$

$.$

$$After the third step,

$3$

$7$

$\%$

$$of

items require rework, which entails

starting over again at step

$1$

$.$

$$All

items that are reworked are

successfully processed. Demand is

$1$

$0$

$$units per hour.

How many units per hour will the

second step process?

Note: Round your answer to

$2$

decimal places.