Marble in a bowl

Consider an immovable bowl in the shape of a perfect hemisphere with radius R=19 cm,R = 19 \text{ cm}, as shown in the diagram below. Now, place a spherical marble with radius r=1 cmr = 1 \text{ cm} on the edge of the bowl ((point A)A) and let it roll.

How long does the marble take to reach the bottom of the bowl ((point B)?B)?

Assume that g=10 m/s2.g = \SI[per-mode=symbol]{10}{\meter\per\second\squared}.

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