SOLUTION: A heater raises the temperature 15 degrees in 24 minutes. With a second heater also in operation, the change takes place in 6 minutes. How long would it take the second heater wo

Question 731542: A heater raises the temperature 15 degrees in 24 minutes.
With a second heater also in operation, the change takes place in 6 minutes.
How long would it take the second heater working alone to produce the same temperature change?
Answer by josgarithmetic(39621) (Show Source): You can put this solution on YOUR website!
Are rates such as those really uniform? That's suspicious.

Anyway, let the rates in degrees per minute b e, and , so we do not know rate n. We are expected to assume that when both heaters operate together, the rates are simply summed. We would do this:

m + n = BOTH-TOGETHER

You can finish from here.
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