Math help pls?

The distance (d) to the visible horizon varies directly with the square root of the height (h) of the observer above sea level. An observer 1.8m tall can see 4.8km out to sea when standing on the shoreline. a) how far could the person see if they climbed a 4m tower? b)if the top of a 10m mast on a yacht is just... show more The distance (d) to the visible horizon varies directly with the square root of the height (h) of the observer above sea level. An observer 1.8m tall can see 4.8km out to sea when standing on the shoreline.

a) how far could the person see if they climbed a 4m tower?

b)if the top of a 10m mast on a yacht is just visible to the observer in the tower, how far out to sea is the yacht.

I've tried to find k using 4800=k(sqrt(1.8)) But the value seems unrealistic and doesn't provide the correct answer where am i going wrong? answer to a is 8.616km and answer to b is 19.93km
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