The time taken for her to paint the entire room is six-fourths of an hour.
From the information given, since Marisa painted one-half of her bedroom in three-fourths of an hour, the time taken to complete the whole room will be:
0.5/1 = 0.75/x
Cross multiply
0.5x = 0.75
x = 0.75/0.5
x = 1.5 = 6/4
Therefore, the time taken for her to paint the entire room is six-fourths of an hour.
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