# Give the units of measure for the rate. (2, 20) and (4, 42); in x in seconds, y in feet

Here,Rate is defined as distance travelled in feet per unit time(i.e., 1 second)
The positions given in the question are:-
20 feet at time=2 second
42 feet at time=4second
$\therefore$ $Rate=\frac{change\, in\, position}{change\, in \, time}$
$\Rightarrow \frac{42-20}{4-2}=\frac{22}{2}ft/sec$

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