To answer this, you will set up a system of equations that represent the situation.
First:
1 - 3/8 = 5/8 left after planting coconuts
Second:
4/5 of 5/8
4/5 x 5/8 = 1/2 of it has bananas
1 - 3/8 - 1/2 = 1/8 left with rice
2.5 acres is 1/8 of it, so 3/8 would be 3 groups of 1/8 or 3 groups of 2.5 (3 x 2.5 = 7.5 acres).
7.5 acres have coconuts
4/8 is 1/2 so 4 groups of 2.5 = 10 acres
10 acres have bananas.