Hi Mariana!

I've asked Head Office to change the wording. I think that the "minute / second" hand wording is a typo! Thank you for asking about this.

Here is an image that illustrates what's going on here: https://i.ibb.co/gSQ6GM6/Capture.png

Remember that the mass of the minute hand will act at its center of mass, which we assume is at the MIDDLE of the bar, which is at 1.5 m (or 3/2 m).

So, the sum of the torques is:

total torque = torque of applied force + torque of weight = (5 N)(3 m) + (100 N)(1.5 m) = 15 Nm + 150 Nm = 165 Nm

Let me know if this helps! 😊