The temperature in St. Paul was #45^circ#F. Five minutes later it was 30°F. What was the average change in temperature in degrees per minute as an integer?

1 Answer
Dec 16, 2016

#(15°)/( 5" minutes") = 3° # per minute


In a rate question you always need to look at the units. They will tell you what to divide by what.

'degrees per minute' means divide the change in degrees by the change in minutes.

The temperature dropped from #45 to 30# which is a change of 15°.
This drop took place over 5 minutes.

Average rate of change = #(15°)/( 5" minutes") = 3° # per minute

An integer is a whole number which our answer is, so no rounding is needed.