algebra
posted by Todd .
Marlene drive 540 miles to visit friend. drive for 3 hours then stopped for gas, then drive 4 more hours stopped for lunch. how many more hours do I drive if my average speed for trip is 60 miles per hour ?
How would I write an equation?

Total time driving = totoal distance/total time
= 540/60 = 9 hrs
But you only drove for 7 hours , so you will need another 2 hours of driving.
No "equation" is needed. 
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