Lisa's hand is located twenty-five feet distant from the rock.
This is further explained below.
Generally, If the rock is falling at a rate of 5 inches per second, then you can easily calculate how deep below the surface of the lake it was after 5 seconds by multiplying 5 by 4.
After four seconds, the rock will have dropped -20 inches.
Because Lisa's hand is five feet above the water's surface, we need to add five to the distance between her hand and the rock in order to calculate how far away it is.
After four seconds, Lisa's hand is located twenty-five feet distant from the rock.
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