Impeller for snowblower and combined snowblower and snowplow

There is provided a snowblower comprising a frame with a transversally extending portion; an auger assembly mounted to the frame and comprising a rotating axle extending substantially parallel to the transversally extending portion and a snow-gathering device mounted to rotating axle and rotating therewith about an auger rotating axis at an auger revolution speed; an impeller assembly mounted to the frame and comprising a snow-expelling device rotatable about an impeller rotation axis at an impeller revolution speed, the impeller rotation axis extending substantially parallel to the auger rotating axis; an actuator assembly configured to engage the auger and impeller assemblies in rotation wherein the impeller revolution speed is greater than the auger revolution speed; and a discharge chute mounted to the frame and having a discharge chute inlet adjacent to the impeller assembly. There is also provided a method for clearing away snow.