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Question
A car goes 15 km on a gallon of octane. When it is 50 km/h. When the car is driven at 60 km/h, it only goes 80% as far. How many gallons of octans are needed to travel 200 km it half the distance is traveled at 50 km/h and the rest 60 km/h ?
15.00
16.67
10.60
14.00
ANSWER : 1
Descrption
<p>At 50km/h</p> <p>15 km needs 1 gallon</p> <p>So, 100 km needs 100/15 gallon</p> <p>At 60km/h,</p> <p>It goes 80% far = 80% of 15 = 12 km</p> <p>12 km needs 1 gallon</p> <p>So, 100 km needs 100/12 gallon</p> <p>So, (100 + 100) = 200 km needs</p> <p> = (100/15 + 100/12) gallon</p> <p> = (400 + 500)/60 gallon</p> <p> = 900/60 gallon</p> <p> = 15 gallon</p>
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