Competing in a mini-triathlon, Catherine ran 3 miles in the same amount of time she biked 12 miles. Her average speed on the bike was 18 mph more than her average running speed. What was her Running speed?
A) 4 mph
B) 6 mph
C) 8 mph
D) 5 mph

Question

Quizplus · Accepted Answer

Let Catherine's running speed be x mph. Then her biking speed is x + 18 mph. Since the time taken for both activities is the same, we have the equation: 3/x = 12/(x + 18). Solving this equation gives x = 6 mph.

Competing in a Mini-Triathlon, Catherine Ran 3 Miles in the Same