Hi,
the only specifiaction we have is 60 RPM.
This is not enough information to decide which motor to choose.
You at least need torque or power, voltage, commutation/driving method and so on
Where to find it. In times of internet I´d so an internet search for motor manufacturers, market places, distributors..
Don´t know where you live and whether it´s a one piece hobby project or a high volume project.
BTW: a gear does not increase power, it increases torque.
It´s important to to use correct terminiology else your math can´t work.
Klaus