Question 1202341
Rosie ran to the park at 7 miles per hour and walked back home at 3 miles per hour. How many miles was it to the park if the round trip took 20 hours? Begin by drawing a diagram of distances traveled and writing the distance equation on your paper.
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Avg speed of a round trip = {{{2v[1]*v[2]/(v[1]+v[2])}}}
= 2*7*3/(7+3) = 4.2 mi/hr
d = r*t = 84 mi
---> 42 miles each way