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Posted by **Felix Ferrer** on Tuesday, October 2, 2007 at 6:15pm.

- Math -
**DrBob222**, Tuesday, October 2, 2007 at 6:26pmdistance = rate x time

Calculate time for each 50 mile increment. Add the times together to obtain total time.

then 100/total time = average rate. Post your work if you get stuck.

- Math -
**Felix Ferrer**, Tuesday, October 2, 2007 at 7:09pmi can't figure it out???

- Math -
- Math -
**DrBob222**, Tuesday, October 2, 2007 at 7:24pmdistance = rate x time

d for 40 mph vehicle = 50 mi = 40 mi/hr x time.

solve for time for 40 mph car = 50/40 = 5/4 hour.

d for 60 mph car = 50 mi = 60 mi/hr x t

solve for t for 60 mph car = 50/60 = 5/6 hr.

Add the times together.

5/4 + 5/6 = 1.250 + 0.833 = 2.083 hours total time.

distance traveled in total time = 100 miles. Average speed = 100 mi/2.083 hours = ??

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