Question 1105953
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The response from the other tutor is a perfectly good one....<br>
I set up the problem a bit differently than she does and arrive at the same equation by a different path.<br>
Take a look at both methods and see if one of them "works" better for you.<br>
Since the ratio of times for the downstream and upstream trips is 2:3, the ratio of speeds must be 3:2.
Then, since the upstream and downstream distances are the same, 3 times the upstream rate must equal 2 times the downstream rate.
And since the rate of the current is 8 kph, the upstream and downstream speeds are x-8 and x+8.  So<br>
{{{3(x-8) = 2(x+8)}}}<br>
which is the same equation she ended up with by a different path.  And so of course the solution from there is as she shows it.