Homework Help: math

Posted by Sara! on Monday, May 31, 2010 at 7:37pm.

a round trip car ride took 12 hours. the first half of the trip took 7 hours at a rate of 4 miles per hour. what was the average rate of speed on the return trip?

how do i write this as an equation?

math - PsyDAG, Tuesday, June 1, 2010 at 11:30am
distance = rate * time

The distance for both directions are equal.

rate1 * time1 = rate2 * time2
math - :), Sunday, October 23, 2011 at 8:17pm
I think its 63 miles per hour.
How i got it:
12 hrs. minus 7 hrs. = 5hrs for the return trip.
45*7= r*5
315==r*5
315/5 = 63 miles per hour
(i think that 63 is the answer. im not sure)

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