Posted by **Debbie** on Sunday, March 14, 2010 at 4:31am.

A cold metal bar at -30 degrees Celsius is submerged in a pool maintained at a temperature of 40 degrees Celsius. Half a minute later, the temperature of the bar is 20 degrees Celsius. How long will it take the bar to attain a temperature of 30 degrees Celsius?

I know that dy/dt=k(y-b) and y(t)=b+Ce^kt

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