If 4 cats can kill 4 rats in 4 minutes, how many minutes will it take 8 cats to kill 8 rats?
It is given that 4 cats can kill 4 rats in 4 minutes
Number of cat-minutes = $$4\times4=16$$
So, in 16 cat-minutes, 4 rats are killed (i.e. one rat gets killed in 4 cat-minutes).
So, 8 rats will need 32 cat minutes.
$$\therefore$$ Time taken by 8 cats to kill 8 rats = $$\frac{32}{8}=4$$ minutes
=> Ans - (B)
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