Final answer:
1 tie down for each 10 feet of cargo is a rule for securing cargo during transportation.
Step-by-step explanation:
The statement "1 tie down for each 10 feet of cargo" is a rule or guideline for securing cargo during transportation.
For every 10 feet of cargo, you should use 1 tie down to keep it secure and prevent it from shifting or falling. A tie down is a device or method used to hold the cargo in place, such as straps, ropes, or chains.
If you have 30 feet of cargo, you would need 3 tie downs. Similarly, if you have 50 feet of cargo, you would need 5 tie downs.