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Car and gas usage

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by mgmt_gmat » Thu Feb 11, 2010 5:29 am
51) At 50 mph a car uses 1 gallon for every 30 miles. If the car starts with a full tank of 12 gallons and drives for 5 hrs at 50mph, the amount of gas used would be what fraction of the tank?
a. 3�25
b. 11�36
c. 7�12
d. 2�3
e. 25�36

Pease explain.
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by ajith » Thu Feb 11, 2010 6:11 am
mgmt_gmat wrote:51) At 50 mph a car uses 1 gallon for every 30 miles. If the car starts with a full tank of 12 gallons and drives for 5 hrs at 50mph, the amount of gas used would be what fraction of the tank?
a. 3�25
b. 11�36
c. 7�12
d. 2�3
e. 25�36

Pease explain.
the total capacity of tank = 12 gallons
Kms run = 250
Gas used = 250/30 gallons
amount of gas used as a fraction of the tank = 250/360 = 25/36
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by thephoenix » Thu Feb 11, 2010 6:30 am
mgmt_gmat wrote:51) At 50 mph a car uses 1 gallon for every 30 miles. If the car starts with a full tank of 12 gallons and drives for 5 hrs at 50mph, the amount of gas used would be what fraction of the tank?
a. 3�25
b. 11�36
c. 7�12
d. 2�3
e. 25�36

Pease explain.
tank=12 gallons
in 5 hrs car drives @ 50mph=250 miles
for 30 miles car consumes =1 gallon
for 250 consumption is=250/30=25/3

fraction=consumption/capacity=25/3/12=25/36
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by shashank.ism » Thu Feb 11, 2010 6:51 am
mgmt_gmat wrote:51) At 50 mph a car uses 1 gallon for every 30 miles. If the car starts with a full tank of 12 gallons and drives for 5 hrs at 50mph, the amount of gas used would be what fraction of the tank?
a. 3�25
b. 11�36
c. 7�12
d. 2�3
e. 25�36

Pease explain.
Velocity of car = 50 mph, In 5 hrs distance covered = 50 x 5 = 250 miles
so volume of gas used = 250/30
fraction of tank = 250/30/12 = 25/36. Ans E
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