Question 1015386
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What is "the trip"?
We can help you more easily if you are precise and complete asking your question.
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If the triangle is a right triangle the longest side is:
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longest side={{{sqrt(4^2+8^2)=sqrt(80)}}}={{{4sqrt(5)}}} miles
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If "the trip" is once down the longest leg in 35 minutes:
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{{{((4sqrt(5)mi)/(35min))(60min/1hr)}}}={{{(48sqrt(5))/7}}} miles per hour