Asked by B

Belle is swimming in the lake and is 230 feet from shore. She starts to head back to shore at arate of 2ft/s. Ten seconds later, Max hops in a row boat and rows towards Belle at a rate of 5 ft/s. How many seconds will Bell have been swimming when Max reaches her?
Answered by Steve
between the two, they cover the 230 ft. So, after Belle has been swimming x seconds,

2x + 5(x-10) = 230
2x + 5x - 50 = 230
7x = 280
x = 40
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