Two dead in separate WA crashes

Two men have died in separate crashes in Western Australia in the 18 hours to 1pm on Saturday.

A 20-year-old man died and a 23-year-old woman suffered life-threatening injuries when two cars collided on Two Rocks Road in Two Rocks, north of Perth, about 7pm on Friday.

Another 20-year-old man suffered minor injuries and a 40-year-old man was taken to the Joondalup Health Campus with critical injuries.

A man died at the scene when his vehicle left the road and hit a tree before rolling over on the Great Southern Highway near Woottating, east of Perth, at 1pm on Saturday.

Police believe speed was a factor in the crash.