Answer
$t=3$ hours
Work Step by Step
If $s(t)=1800$
$ 1800=525t+25t^{2}\qquad$ divide with 25
$72=21t+t^{2}$
$t^{2}+21t-72=0$
$(t+24)(t-3)=0$
Discarding the negative solution $(-24$ h),
$t=3$ hours
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 13 - Section 13.1 - The Indefinite Integral - Exercises - Page 960: 67b
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