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When cooking multiple items of varying temperatures in a conventional oven, use the natural inclination of heat to rise.
The oven can be set at minimum required temperature and still cook fully and properly, items which need a higher temperature; by placing the lower temperature item on the bottom and higher temperature items higher up.
I haven't noticed this affecting cooking times either.

This will not work with a convection oven unless the fan is off because convection ovens use a fan to create uniform heat throughout the oven.