Tina Is Training for a Biathlon

question 63

Multiple Choice

Tina is training for a biathlon. To train for the running portion of the race, she runs 14 miles each day, over the same course. The first 4 miles of the course is on level ground, while the last 10 miles is downhill. She runs 3 miles per hour slower on level ground than she runs downhill. If the complete course takes 1 hour, how fast does she run on the downhill part of the course?

• A) 12 mph
• B) 15 mph
• C) 18 mph
• D) 30 mph
• E) 9 mph

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Costs that do not vary with the level of production or sales, such as salaries of permanent employees and rent.

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