Solution:

1. It would take 5 minutes for 3 monkeys to eat 3 bananas; and

2. it would take 5 monkeys 20 minutes to eat 20 bananas.

Food for thought:

What assumptions are made in arriving at the solution?

Does one assume that 5 monkeys take 1 minute to eat 1 banana and that all bananas are consumed at the same pace?

Or does one assume that 1 monkey takes 5 minutes to eat 1 banana and that all monkeys eat at the same pace?

Think it over!