A hybrid car has a 15-gallon fuel tank and uses one gallon of fuel to travel 45 miles. If the driver of the car begins her trip with a full tank and drives for 8 hours at a constant rate of 60 miles per hour, what fraction of her fuel tank is full at the end of the trip?
A. \(\dfrac29\)
B. \(\dfrac{11}{48}\)
C. \(\dfrac{13}{45}\)
D. \(\dfrac13\)
E. \(\dfrac{17}{48}\)
Answer: C
Source: Veritas Prep
A hybrid car has a 15-gallon fuel tank and uses one gallon of fuel to travel 45 miles. If the driver of the car begins
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Fuel tank capacity \(= 15\) GVJesus12 wrote: ↑Wed Nov 17, 2021 1:01 pmA hybrid car has a 15-gallon fuel tank and uses one gallon of fuel to travel 45 miles. If the driver of the car begins her trip with a full tank and drives for 8 hours at a constant rate of 60 miles per hour, what fraction of her fuel tank is full at the end of the trip?
A. \(\dfrac29\)
B. \(\dfrac{11}{48}\)
C. \(\dfrac{13}{45}\)
D. \(\dfrac13\)
E. \(\dfrac{17}{48}\)
Answer: C
Source: Veritas Prep
Car burns \(1\) G for each \(45\) miles driven
After driving for \(8\) hours at \(60\) miles/hour \(\Longrightarrow\) Distance driven \(= 8*60 = 480\) miles
Gas burnt to drive \(480\) miles \(= \dfrac{480}{45}\) G
Gas left in the tank \(= 15 - \dfrac{480}{45} = 15 - \dfrac{32}{3} = \dfrac{13}{3}\) G
Fraction of gas left to total capacity \(= \dfrac{\,\dfrac{13}{3}\,}{15} = \dfrac{13}{45}\)