SOLUTION: Susie runs a mile every day for a week (7DAYS). Her average speed is 8 minutes. She runs another day, Now her average speed is 7.8 minutes. How fast did she run on the 8th day?
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Question 735314: Susie runs a mile every day for a week (7DAYS). Her average speed is 8 minutes. She runs another day, Now her average speed is 7.8 minutes. How fast did she run on the 8th day? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! When you refer to speed, it's mph, km/h, miles per minute etc. not minutes
:
Perhaps you mean:
"Susie runs a mile every day for a week (7DAYS).
Her average time is 8 minutes.
She runs another day, Now her average time is 7.8 minutes.
What as her time on the 8th day?
:
Let m = time in minute to run a mile on the 8th day
: = 7.8
56 + m = 8(7.8)
m = 62.4 - 56
m = 6.4 min to run a mile on the 8th day
