<PRE><B>Question 686928</B>
Which of the following is an inverse variation?

A: 
Sally works 2 hours and earns 10 dollars, if she works 4 hours she earns 20 dollars
Ans: Direct
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B: 
A car travels 200 miles in 4 hours, it travels 100 miles in 2 hours.
Ans Direct
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C: 
A biker traveling 8mph covers 8 miles in 1 hour, if he decreases his speed to 4mph it will take him 2 hours to cover the same distance 
Ans: rate and time are inversely relate:: d = r*t
As r increases t must decrease if d is to remain the same
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D: 
A pond of 1 acre has 2000 fish, a pond of 3 acres has 6,000 fish
And: Direct
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Cheers,
Stan H.
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</PRE>