SOLUTION: how long will it take lemonade to go from 68 degrees Fahrenheit to 38 degree Fahrenheit if its temperature drops 25 degrees Fahrenheit every 30 minutes

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Question 713069: how long will it take lemonade to go from 68 degrees Fahrenheit to 38 degree Fahrenheit if its temperature drops 25 degrees Fahrenheit every 30 minutes
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
( change in temperature ) / ( change in time ) = -25 / 30 degrees/min
Let +t+ = the change in temperature
+%28+38+-+68+%29+%2F+t++=+-25+%2F+30+
+-30+%2F+t+=+-5%2F6+
+-30%2A6+=+-5t+
+5t+=+180+
+t+=+36+
It will take 36 minutes