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Let x be the distance under the question.
It means that he just traveled x miles and 125-x miles left to travel.
From the condition, you have this proportion
=
.
From the proportion
3x = 2*(125-x),
3x = 250 - 2x
3x + 2x = 250
5x = 250
x = 250/5 = 50.
ANSWER. The distance Herman have traveled when he stops for lunch is 50 miles.
Solved.