Mathematics, 04.10.2021 08:00 senituliii

Kathy left home to walk to the mall, walking quickly at a rate
of 4 miles per hour. Her sister Abby left home 15 minutes later and rode her bike to the mall at a rate of 10 miles per hour. How long will it take Abby to catch up to Kathy?

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Kathy left home to walk to the mall, walking quickly at a rate
of 4 miles per hour. Her sist...