intelligence test question

No.14370313 ViewReplyOriginalReport
if you answered the right way you passed, answering correctly means using no algebra

A motorboat goes from point A to point B on a river, against the current, and takes 4 hours. Going the opposite way, i.e. with the current, it takes only 3 hours.

How long would it take the boat to get from A to B if there were no current?