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To determine the revolutions per minute (RPM) of a driveshaft making 40 revolutions in 2.5 minutes, you first need to convert the time period into a per-minute basis.

You start by calculating how many revolutions occur in one minute. Since 2.5 minutes is the given duration for 40 revolutions, you can divide the total number of revolutions by the total time in minutes to find the revolutions per minute:

1. Calculate revolutions per minute (RPM):

- 40 revolutions / 2.5 minutes = 16 revolutions per minute.

Thus, the driveshaft's speed is 16 RPM. This is why the correct answer is that it makes 16 revolutions in one minute.