GMATprep problem

Car uses 1 gallon per 30 miles.
Hence 1/3 gallon for 10 miles.

So total gasoline usage for 50 miles - 5/3 gallons
Since the travel time is 50 miles per hour.

Hence, per hour gasoline consumption = 5/3 gallons.
So 5 hr gasoline consumption = 5 *(5/3) = 25/3 gallons.

Fraction = (25/3)/12 = 25/36

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