Given the answer choices, the prompt should read as follows:
BTGmoderatorDC wrote:Little Texas Drilling Company has three wells, each producing oil at a constant rate. Well A produces one barrel every two minutes. Well B produces one barrel every three minutes. Well C produces one barrel every four minutes. How many hours does it take Little Texas Drilling Company to produce 185 barrels of oil?
(A) 2
(B) 3
(C) 4
(D) 18
(E) 180
A's rate = (1 barrel)/(2 minutes) * (60 minutes)/(1 hour) = 30 barrels per hour.
B's rate = (1 barrel)/(3 minutes) * (60 minutes)/(1 hour) = 20 barrels per hour.
C's rate = (1 barrel)/(15 minutes) * (60 minutes)/(1 hour) = 15 barrels per hour.
Since the combined rate for A+B+C = 30+20+15 = 65 barrels per hour, the time to produce 185 barrels = w/r = 185/65 = 3 hours.
The correct answer is
B.
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