Problema Solution
Whitney left school and drove 7 miles to meet her mother at a restaurant. Her mother left at the same time and drove 8 miles, traveling 5mi/h than her daughter. If the two arrived at the same time, what was Whitney's speed?
Answer provided by our tutors
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
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Whitney's speed is 35 mi/h.