Easiest way is to break the task down into each resource- so under the main task which would have no resources, you have linked tasks with durations of 8 hrs, 2 hrs, and assign each resource to it. this allows you to update accurately if it needs it.
Alternatively put it in as an 11 hr task, then assign a %age of each resource, so writer is used for 2 hrs from 11 or 18%, with the other 2 accounting for 41% each.
You can then change rates for any involved resources as you wish.