SOLUTION: Need help solving this one :( You must leave for campus in 10 minutes or you will be late for your Algebra test. Unfortunately, you are snowed in. You can shovel the entire drivew

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Question 897415: Need help solving this one :(
You must leave for campus in 10 minutes or you will be late for your Algebra test. Unfortunately, you are snowed in. You can shovel the entire driveway in 20 minutes. Your brother can do it in 18 minutes. If you shovel together, how long will it take to clear the driveway?
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
1/10 + 1/18 = 1/t where t is time in minutes working together
18/180 + 10/180 = 1/t
28/180 = 1/t
28t = 180
t = 6.428571429 approx 6.43 minutes