Question 437384
How long will it take a 6 foot wide planter to cover completely 42 acres at 6mph?
..
At 6 mph, tractor covers:
6ft*5280ft/hr=31680 sq ft/hr 
1-mile = 5280 ft
1 acre=43560 sq ft

42*43560 sq ft/31680 sq ft/hr=57.75 hrs
ans:

It will take a 6 foot wide planter 57.75 hours to cover completely 42 acres at 6mph