Answer:
The assets turnover for the three companies are as follows:
YRC Worldwide Union    1.54 Â
Pacific C.H. Â Â Â Â Â Â Â Â Â Â Â 0.40 Â
Robinson Worldwide Inc   4.84 Â
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  Â
Sales            4,334,640.00  16,965,000.00  9,274,305.00 Â
Average Total Assets 2,812,504.00 Â 42,636,000.00 Â 1,914,974.00 Â
Asset turnover=net sales/average total assets
                     1.54               0.40          4.84
                           Â