At noon a plane departed St. Louis, Missouri, for Los Angeles 2100 kilometers away flying at an average speed of 450 kilometers
per hour. One hour later a jet left
Los Angeles for St. Louis averaging 650 km/h. At what time did they pass each other?

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so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130