The amount of oil used by a ship traveling at a uniform speed varies jointly with the distance and the square of the speed. The ship uses 30 barrels of oil in traveling 85 miles at 42 mi/h. How many barrels of oil are used when the ship travels 26 miles at 54mi/h? Round your answer to the nearest tenth of a barrel if necessary.

Question

blake57roger · Answer

30=k * 85*(42)^2
30 = 149940k 
k = 30/149940 = 3/14994 = 1/4998 
d = 26
s = 54
O = (26•54^2)/4998 ≈ 15.2

anonymous · Answer

Ok thanks! I'm glad I did it right. The question was confusing, but I came to that same conclusion. @blake57roger

blake57roger · Answer

thanks