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21-12-2022
Mathematics

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five runners together complete a $100$-mile endurance race by running separate, non-overlapping portions of the course. runner b's portion is $1.5$ times the length of runner a's portion. the combined portion for runners c and d is twice the length of the combined portion for runners a and b. runner e then runs the last $10$ miles of the race. how many miles did runner b run?

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