An improvised rocket is launched from the top of a building \(150 \text{ feet}\) high. The height\(\text{ (H) }\)reached by the rocket after\(\text{ (t) }\)seconds is given by the function:

\[ \large H( t ) =40t-10{ t }^{ 2 } \]

How long (in seconds) did it take to reach the highest point?

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