Answer:
average hours = 200 
average hours = 166.67
Step-by-step explanation:
given data 
vans produced = 7,200 
labor productivity = 0.10 vans per labor hour
Laborers = 360
to find out
How many hours average laborer work that month and If productivity can be increased to 0.12 then How many hours average laborer work
solution
average laborer work that month is express as 
Laborers × average hours × labor productivity = vans produced
put here value
360 × average hours × 0.1 = 7200 
 so 
average hours = 200 
 and 
 Laborers × average hours × labor productivity = vans produced
 put here increase productivity
360 × average hours × 0.12 = 7200 
 so average hours = 166.67