Please evaluate the accurate answer of the given Problem
Problem- A student project is required to be portable and hand-held. It requires 6 V DC power at a current of 90 mA. The batteries for the power supply must last for a minimum of 20 hours of continuous operation. NiMH rechargeable batteries in AA size are to be used.
Part 1- How many batteries are needed?
Part 2- What mAh capacity should the batteries have?
I want help to find how many batteries are needed.