Lori is training for a marathon. On Friday, she ran 16 miles at a constant rate of 8 mph. On Saturday, she ran 15 miles at a constant rate of 7.5 mph. On Sunday, Lori ran 21 miles at a constant rate of 7 mph. How much time did Lori train in all the three days? A. 3 hr. B. 5 hr. C. 7 hr. D. 9 hr.

C. 7 hr

Step-by-step explanation:

On Friday, she ran for 16 miles at 8 Miles per hour. 16÷8=2, therefore on Friday she ran for 2 hours. On Saturday she ran for 15 miles at 7.5 Miles per hour. 15÷7,5=2, therefore on Saturday she ran for 2 hours. On Sunday she ran for 21 miles at 7 Miles per hour. 21÷7=3, therefore on Sunday she ran for 3 hours.

With a total of 2+2+3=7, we can say that Lori trained running throughout all 3 days for a total time of 7 hours. Thus the answer is C. 7 hr

Hope this helps!

Kind regards

Farah Syed

80% of the cookies

step-by-step explanation:

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17