Strange.......

the ratio of the two volumes is equal to the qubic power of the ratio of the two heights

therefore find the ratio of the two volumes ..get the qubic root and then use this ratio to find the height of the two pyramides...it is easy.

The same applies for the total surface but here the ratio between the two surfaces is equal to the square of the ratio of the two heights.

You need however the slant height of one triangle to calculate the area of one triangle. ..........