∵OA, OB and OC are the three bisectors of △ABC.

∴OD=OE=OF，

∫△ABC's three sides AB, BC and CA are 40, 50 and 60 respectively.

∴s△abo:s△bco:s△cao=( 1/2ab？ OD): (BC 1/2? OF):( 1/2 AC？ OE)=AB:BC:AC=40:50:60=4:5:6

So the answer is: 4: 5: 6.