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circuscircus
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Homework Statement
Julie drives 100mi to Grandmother's house. On the way to Granmothers, Julie drives half the distance at 40mph and half the distance at 60mph. On the returntrip, she drives half the time at 40mph and half at 60mph.
What is her average speed on the return trip?
Homework Equations
v = v[0] + a dt
s[f] = s[0] + v[0] dt + 1/2 a dt^2
The Attempt at a Solution
I need to find the time first I think and then do .5*40t + .5*60t but I'm not sure how to find t