Thank you Mapes.
I'm not sure what the last sentence of the problem means, but I assumed 24.5 C - 15.5 C was the change in temperature and 12.0 h + 12.0 h was the change in time.
Homework Statement
For bacteriological testing of water supplies and in medical clinics, samples must routinely be incubated for 24 h at 37°C. A standard constant temperature bath with electric heating and thermostatic control is not suitable in developing nations without continuously...