Question 10

If 4 cats can kill 4 rats in 4 minutes, how many minutes will it take 8 cats to kill 8 rats?

Solution

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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