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A certain car can travel 40 minutes on a gallon of gasoline at 60 mile

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A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 10 Jul 2015, 02:35
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A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

Kudos for a correct solution.

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A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 10 Jul 2015, 04:19
Bunuel wrote:
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

Kudos for a correct solution.


Total time for travelling 80 miles @ 60 mph = 80/60 = 4/3 hour = 80 minutes.

Given, the car uses 1 gallon for every 40 minutes of driving @ 60 mph. Thus in 80 minutes it will use = 2 gallons. Thus, full tank = 2+8 = 10 gallons ---> 2/10 = 20% of the fuel used. B is the correct answer.
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Re: A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 10 Jul 2015, 07:15
Bunuel wrote:
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

Kudos for a correct solution.


Let, Tank capacity = T gallon
Used Fuel = (T-8) gallons
Distance Travelled (@60 miles/hr) = 80 miles

Distance travelled in 1 gallon = Distance travelled in 40 mins (@60 miles/hr) = (60/60)*40 = 40 miles
Fuel used to travel 80 miles = (80/40) = 2 gallon

i.e. Used fuel = (T-8) = 2 gallon
i.e. T = 10 Gallons

i.e. Used Fuel = (2/10)*100 = 20%
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Re: A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 10 Jul 2015, 07:38
Bunuel wrote:
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

Kudos for a correct solution.


Hi,
Not a very well worded Q as we have to assume things not stated in the question.
We have not been told that the car travelled only this stretch of 80 miles meaning the veh started at that speed and stopped at that speed and nothing else was travelled..
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Re: A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 11 Jul 2015, 11:03
Bunuel wrote:
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

Kudos for a correct solution.


Speed of the car=60 miles per hours i.e 1 mile per minute
Therefore, to travel 80 miles the car takes 80 minutes @60 miles per hour
Also, since it runs for 40 minutes on 1 gallon, it will take 2 gallons to run for 80 minutes
Fuel left=8 gallons
Consumed=2 gallons
% of tank used=2/10=20%
Answer B
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Re: A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 13 Jul 2015, 02:55
Bunuel wrote:
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%

Kudos for a correct solution.


800score Official Solution:

(B) 60 miles per hour is a mile a minute. 80 miles at 60 miles per hour will take 80 minutes. Since 40 minutes is 1 gallon, 80 minutes will be 2 gallons. The full tank holds 2 + 8 = 10 gallons. 2 gal/10 gal = 2/10, which is 20%.

The correct answer is choice (B).
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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 23 Aug 2017, 09:36
40 miles req 1 gallon of oil
therefore, 80 miles will require 2 gallons of oil.

8 gallons oil is left after the ride. So total tank capacity is 2+8=10 gallons.

%oil used for travelling 80 miles at 60 m/hr = 2/10*100=20%

Correct answer is B.
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A certain car can travel 40 minutes on a gallon of gasoline at 60 mile [#permalink]

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New post 23 Aug 2017, 11:37
Bunuel wrote:
A certain car can travel 40 minutes on a gallon of gasoline at 60 miles per hour. If the car had started with a full tank and had 8 gallons of gasoline left in its tank at the end, then what percent of the tank was used to travel 80 miles at 60 mph?

A. 15%
B. 20%
C. 25%
D. 30%
E. 40%


at 60 mph, 40 minutes=40 miles
if 40 miles take 1 gallon,
then 80 miles take 2 gallons
2/(8+2)=.2=20%
B
A certain car can travel 40 minutes on a gallon of gasoline at 60 mile   [#permalink] 23 Aug 2017, 11:37
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