The mechanical advantage (MA) of an inclined plane (such as a ramp) can be calculated using the formula:
\[ MA = \frac{\text{length of the ramp}}{\text{height of the ramp}} \]
Rearranging this formula to find the length of the ramp (L) gives us:
\[ L = MA \times \text{height} \]
Given that the mechanical advantage (MA) is 2.15 and the height of the ramp is 6.05 m, we can substitute these values into the formula:
\[ L = 2.15 \times 6.05 \]
Calculating this gives:
\[ L = 2.15 \times 6.05 = 12.9925 \text{ m} \]
Rounding this gives approximately \( 13.0 \text{ m} \).
Therefore, the length of the ramp is 13.0 m.