Three workers trying to move a 1 × 1 × 1.2-m crate apply to the crate the three horizontal forces shown. (a) If P = 240 N, replace the three forces with an equivalent force-couple system at A.

(b) Replace the force-couple system of part a with a single force, and determine where it should be applied to side AB.

(c) Determine the magnitude of P so that the three forces can be replaced with a single equivalent force applied at B.