Canadian striker Davide Xausa grabbed two first half goals to put Jim Leishman's side in firm control.
Xausa netted his first after just seven minutes and he doubled the lead with his second and his third goal of the season in the 34th minute.
Nathan Lowndes wrapped up the victory with the third four minutes from time.
Motherwell continued their recent improved form with a hard-fought 3-2 win over in-form Aberdeen at Fir Park.
A late goal from James McFadden gave Eric Black's men the win after Aberdeen had fought back from two goals down.
Stephen Pearson fired the home side in front after just seven minutes with his first ever goal for the club.
Northern Ireland international Stuart Elliott doubled the lead with his fifth goal of the season just ten minutes later.
Robbie Winters pulled one back for the visitors five minutes from time for his seventh goal of the season.
The Dons drew level draw with a 79th minute strike from Moroccan star Hicham Zerouali.
It looked like the game would end all-square until McFadden's late intervention eight minutes from time.
St Johnstone recorded only their second win of the season with a narrow 1-0 success over Kilmarnock at McDiarmid Park.
Former Sunderland striker Craig Russell grabbed the only goal of the game after 11 minutes to give Saints the points and ironically Kille have been the victims for Saints' two wins this season.
David Mackay grabbed a late equalizer to give Dundee a 1-1 draw with Hearts at Dens Park.
Andrew Webster had fired the visitors in front after 28 minutes with his first goal of the season, but Mackay earned Ivano Bonetti's side a point with a equalizer ten minutes from time.
A late goal from Stephen McConalogue earned Dundee United a 1-1 draw with Dunfermline at East End Park.
Stewart Petrie had given The Pars the lead after 69 minutes with his second goal of the season, but McConalogue stunned the home side with the equalizer three minutes from time.
Click on fixture for full match summary
Dundee 1-1Hearts
Dunfermline 1-1 Dundee Utd
Hibernian 0-3 Livingtson
Motherwell 3-2Aberdeen
St Johnstone1-0 Kilmarnock
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