Difficult# Work: Pulling a Sled

CLMECH-4SFK1Z

Aaron is pulling his little sister in a sled. The combined mass of his sister and the sled is $28\:kg$. He pulls the sled at a constant speed across the snow (coefficient of kinetic friction, $\mu = 0.10$) and his force on the sled is angled at $25^\circ$ above the ground. He pulls the sled $18\:m$ across level ground before pulling his sister $22\:m$ up a $15^\circ$ hill.

What is the total work done by Aaron on the sled?