When using 10 tubes of 120mm mortars for an FPF, what is the expected length and width?

The expected length and width when using 10 tubes of 120mm mortars for a Final Protective Fire (FPF) is based on standard calculations for mortar fire missions. The length is often associated with the number of tubes fired and the coverage they can provide, while the width is determined by the spread of the ordinance across the target area.

In this case, a configuration of 400 meters for length and 100 meters for width is a recognized standard used for 10 tubes of 120mm mortars. This spans a sufficient area to provide effective coverage, ensuring both lethality and deterrence in a combat scenario. Mortar fire is designed to suppress and neutralize enemy forces, and the dimensions given reflect a tactical approach to achieve those goals.

The other options, while they may reflect different configurations, do not align with the typical military doctrine for using 10 tubes of 120mm mortars for an FPF, making the choice of 400 meters by 100 meters the most accurate in this context.