The traffic flow rate (cars per hour) across an intersection is
r
(
t
)
=
300
+
800
t
−
120
t
2
\displaystyle {r}{\left({t}\right)}={300}+{800}{t}-{120}{t}^{{2}}
r
(
t
)
=
300
+
800
t
−
120
t
2
, where
t
\displaystyle {t}
t
is in hours, and
t
\displaystyle {t}
t
=0 is 6am. How many cars pass through the intersection between 6 am and 10 am?
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