∵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.