Question 1204127
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The ratio of the two speeds is 10:25 = 2:5.  Because the distances there and back are the same, the ratio of times at the two speeds is 5:2.<br>
Let x be the number of hours it took Lois to ride to her friend's house
Then x-1.5 is the number of hours it took her to return home<br>
The ratio of the numbers of hours is 5:2<br>
{{{x/(x-1.5)=5/2}}}
{{{5x-7.5=2x}}}
{{{3x=7.5}}}
{{{x=2.5}}}<br>
ANSWER: It took Lois 2.5 hours to ride to her friend's house<br>