Question 1096980
<br>The upstream and downstream distances are the same.  That means more time is spent at the lower upstream rate than at the higher downstream rate.<br>
If you want an exact answer for the amount of time spent rowing upstream, then you can use the ratio of the speeds and the given total time to get that answer.<br>
But since the question is multiple choice, it is easy to pick the right answer.  Half of the total 48 minutes would be 24 minutes; the time spent rowing upstream has to be a bit more than that.<br>
So answer choice B, 26 minutes.