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Mathematics 7 Online
OpenStudy (anonymous):

PLEASEEE HELP Mason and Nora decided to swim across the river. Mason began swimming 25 seconds earlier than Nora. Mason swam at a speed of 4 feet per second. Nora swam at a speed of 5 feet per second. For how many seconds had Mason been swimming at the moment when the two swimmers had swam exactly the same distance??

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