Using a constant rate, you can saw a log into 3 pieces in 12 minutes.

Question

Using a constant rate, you can saw a log into 3 pieces in 12 minutes. At the same constant rate, how long will it take you to cut a similar log into 6 pieces? 

Answer 1

it takes 12 minutes to cut a log into 3 pieces

to cut a log into 3 pieces it takes only 2 cuts

therefore it takes 6 minutes per cut

to cut a log into 6 pieces you make only 5 cuts

each cut takes 6 minutes, so 5*6=30 minutes to cut a log into 6 pieces