Mathematics, 17.02.2021 18:00, Learsyguerra26

(10. Ria and John started walking at constant speeds from the same spot in opposite directions along the beach. After they had walked for 30 minutes, they were 4km apart.
Rita's speed was 3.5km/h. What was John's speed?

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(10. Ria and John started walking at constant speeds from the same spot in opposite directions alon...