A boy makes a pinhole camera out of a cardboard box with the dimensions 10.0 cm x 10.0 cm x 16.0 cm. A pinhole is located in one end, and a film 8.0 cm x 8.0 cm is placed in the other end. How far away from a tree 25.0 m high should the boy place his camera if the image of the tree is to be 6.0 cm high on the film?