SOLUTION: Betty runs 70 metres in 8.4 seconds. if she maintains the same average speed. In what time will she run 100 metres

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Question 973587: Betty runs 70 metres in 8.4 seconds. if she maintains the same average speed. In what time will she run 100 metres
Answer by algebrahouse.com(1659) About Me  (Show Source):
You can put this solution on YOUR website!
Set up a proportion, then cross-multiply and divide.

70 meters / 8.4 seconds = 100 meters / x seconds
70x = 840 {cross-multiplied}
x = 12 seconds {divided each side by 70}

In 12 seconds, she will run 100 meters

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