## Task 2 - 020622

In the workshop class, Regine uses a bench drill. She knows that the drill penetrates $\frac{1}{4} \mathrm{~mm}$ into the workpiece with each revolution.

She needs to drill through a workpiece that is $30 \mathrm{~mm}$ thick. The drill machine makes 240 revolutions per minute.

How long will it take Regine to complete the drilling?
For a depth of $30 \mathrm{~mm}$, the drill requires $\frac{30 \mathrm{~mm}}{\frac{1}{4} \mathrm{~mm}}=120$ revolutions and thus half a minute $=30 \mathrm{~s}$.