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OpenStudy (howard-wolowitz):
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OpenStudy (love_ranaa):
let w = the speed of Whitney m = the speed of her mother her mother is traveling with 5 mi/h more then Whitney m = w + 5 since they travel the same time we have 7/w = 8/m cross multiply 7m = 8w plug m = w + 5 into the last equation 7(w + 5) = 8w by solving we find w = 35 mi/h So the answer is C. 35 mi/h
OpenStudy (howard-wolowitz):
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