Three hundred gallons of fuel are purchased at $0.90 per gallon. The fuel is consumed at a rate of $0.50 worth of fuel per hour. At this rate, how many hours are required to consume the 300 gallons of fuel?  Choose one
A) 510
B) 520
C) 530
D) 540
E) 550
The fuel is consumed at this rate: $0.50/$0.90 = 5/9 gallons per hour.   The time it takes to consume 300 gallons is:  300 / (5/9)= 
<gadget id="calculator"> 300 / (5/9)</gadget>
<output>540</output>
540 hours.   The answer is 540.
<result>D</result>
Three hundred gallons of fuel are purchased at $0.90 per gallon. The fuel is consumed at a rate of $0.50 worth of fuel per hour. At this rate, how many hours are required to consume the 300 gallons of fuel?