Part $-$ C

Solving Assignment problem....A departmental head has four subordinates, and four tasks to be performed. The subordinates differ in efficiency, and the tasks differ in there intrinsic difficulty. His estimate, of the time each man would take to performeach task, is given the matrix below

$\backslash$table$[[$Men$],[$Persons$,1,2,3,4],[$A$,18,26,17,11],[$B$,13,28,14,26],[$C$,38,19,18,15],[$D$,19,26,24,10]]$

$\frac{2}{3}$