5-P9. Shafts A and B connect the gear box to the wheel assemblies of a tractor, and shaft C connect sit to the engine. Shafts A and B lie in the vertical yz plane, while shaft C is directed along the x axis. Replace the couples applied to the shafts with a single equivalent couple, find the magnitude of resulting couple and the unit vector along the resulting couple's direction.

Fig: 1

Fig: 2