Answer:
The assets turnover for the three companies are as follows:
YRC Worldwide Union      1.54  
Pacific C.H.                       0.40  
Robinson Worldwide Inc     4.84  
Asset turnover implies how much sales generated by an organization from $1 of asset deployed to the business.
Judging from the above,Robinson Worldwide Inc  was the most effective in using its assets to generate sales.It generated $4.84 in sales for every $1 of asset used.
Explanation:
         YRC Worldwide Union	Pacific C.H.  Robinson Worldwide Inc
Asset turnover=net sales/average total assets    
Sales                      4,334,640.00   16,965,000.00   9,274,305.00  
Average Total Assets 2,812,504.00   42,636,000.00   1,914,974.00  
Asset turnover=net sales/average total assets	
                                          1.54                             0.40                  4.84