Question

The temperature of water in a lake decreases 12 degree in 3 hours. How much temperature does water decrease every hour on average? Represent the quotient as a rational number.

Answer 1

We have a rate of 12 degrees every 3 hours, then, to find the rate for every hour we just divide this rate by 3.

$-\frac{12^o}{3h}=-\frac{4^o}{h}$

We have a rate of decrease of 4 degrees/h.