SOLUTION: It takes john 12 seconds to run 80meters. If he runs at the same rate,how long does it take him to run 140meters?

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Question 858444: It takes john 12 seconds to run 80meters. If he runs at the same rate,how long does it take him to run 140meters?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
12/80=x/140
x=12*140/80
x=21 sec