The times at which the ball is on the ground
36/35 or 1 1/35. Change the denominators to a common one of 35, which in order to get an equivalent fraction, you change it to 21/35 and 15/35.
350/20 = unit rate
350/20 = 17.5 or 17 and 1/2
17.5 miles per one gallon
875/17.5 = 50 gallons
Answer: 50 gallons of gas
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