config a layer 3 switch with vlan 1 and 2 each haveing different gateways

I am working on a network project where you have 1 layer-3 dell power connect 6024switch with 2 vlan one for voice and other is for data so i ve two gateway one for the voice and one for the data

Internal routing from vlan 1 to 2 is taken care of the layer 3 switch and that works fine .

but i really have a problem in pushing the data from the vlan interface of 1 and 2 to their respective gateway , i cant use the last resort command ip route 0.0.0.0 0.0.0.0 the last resort ip as there is two gateway .

Note : the vlan 1 and vlan2 interface ip and gateway ip are in same network.

so if u have any soloution pls let me know

Thank in advance for your help

Regards
SAVVY