Jill was training for a triathlon, so she planned a day of exercising. she spent a total of 2 hours riding her bike and running. she biked for 12 miles and ran for 6 miles. her rate for running was 10 mph less than her biking rate. what was her rate when running?

Jill's rate of running = 4.667 miles/hr

Step-by-step explanation:

Let's say that rate of running = x miles/hr

so rate of biking = (x + 10) miles / hr

Time of running = rate of running / distance of running = x/6

Time of biking = rate of biking/distance of biking = (x+10)/12

Total time of cycling and biking = Time of running + Time of biking

Given that total time of cycling and biking = 2 hrs

⇒ 2 = (x/6) + ((x+10)/12)

⇒ 2 = (2x+x + 10)/12

⇒ 2 × 12 = 3x + 10

⇒24 - 10 = 3x

⇒x = 14/3 =4.667 miles/hr

Hence Jill's rate of running = 4.667 miles/hr

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation:

answer: 5100 just subtract

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