Algebra2

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 54 mi/h? Round your answer to the nearest tenth of a barrel, if necessary.

2.3

15.2

49.6

9.2

My answer is 15.2 barrels

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  1. Oil=m*distance*speed^2
    30=m*85* 42
    m=30/85*42^2

    barrels=m*d*speed^2
    barrels=(30/(84*42^2)) * 26*54^2

    I get 15.2 also

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    bobpursley
  2. 30 * (54/42)^2 * (26/85)

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  3. thank you

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