Problema Solution
you average 40 mph on your 25 mile trip to school. if you average 42 mph for the entire round trip, what was your average returning from school
Answer provided by our tutors
let
t = the time of the return trip
25/40 = 0.625 h is the time of the trip to school since time=distance/speed
the average speed = total distance/total time
42 = 2*25/(0.625 + t)
by solving we find
t = 95/168 h
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the average speed of the return trip
v = d/t
v = 25/(95/168)
v = 44.21 mph
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