To find the surface area of a rectangular prism, we need to calculate the area of each face and then sum them up.
The front and back faces are both rectangles with dimensions 3 in by 5 in, so their areas are 3 * 5 = 15 in² each.
The top and bottom faces are also rectangles with dimensions 3 in by 4 in, so their areas are 3 * 4 = 12 in² each.
The left and right faces are rectangles with dimensions 4 in by 5 in, so their areas are 4 * 5 = 20 in² each.
Now we sum up all the areas:
2(15 in²) + 2(12 in²) + 2(20 in²) = 30 in² + 24 in² + 40 in² = 94 in²
Therefore, the surface area of the rectangular prism is 94 in².
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