Hey,here is the answer to ur question....!!
given: 2 1/4 hours preparing te arena ..
2 1/2 hours in ticket office
3 3/5 hours during the gig
To find : total hours worked=?
Solution: 2 1/4=9/4
2 1/2=5/2
3 3/5=18/5
=> 9/4+5/2+18/5= total hours worked
=>45+50+72/20=167/20....
Hope this helps u...!!!