A motorboat going down stream overcome a float at a point \( \mathrm{M} \) which is fixed with r...

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A motorboat going down stream overcome a float at a point \( \mathrm{M} \) which is fixed with respect to ground. 60 minutes later it turned back and after some time passed the float at a distance of \( 6 \mathrm{~km} \) from the point \( M \). Find the velocity of the stream assuming a constant velocity for the motorboat in still water.
(a) \( 4 \mathrm{~km} / \mathrm{h} \)
(b) \( 7 \mathrm{~km} / \mathrm{h} \)
(c) \( 3 \mathrm{~km} / \mathrm{h} \)
(d) \( 6 \mathrm{~km} / \mathrm{h} \)
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