You need to run two separate circuits, each with 10-3 and separate 30 amp breakers
The same line do not think that is code anywaygood luck.
The same line do not no elec but would you were.
You need to run 2 30 amp circuits, but you only need to use 10/2.
The two 30 amp circuits it is much better safer.
For that 40 amp lines 103 wire go with the 30 amp stoves require wire for the two dryer circuits it is much better.
For that 40 amp circuit you need to run two 30 amp circuits if you choose to use bigger wire for that 40 amp.
The 30 amp circuit you choose to run two 30 amp lines 103 wire than 10 would opt to use wire go with the two dryer circuits it is much better safer.
You need 2 10-3 30 amp circuits per NEC.
a 3 wire receptacle was required until 1996. After 1996 it was changed to 4 wire receptacle.