There are 10 trees spaced out equally along my street with one at each end. If I run at a steady speed from one end of the street, I can reach the 5 th tree in just 5 seconds.

How long would it take me to run down the whole street at the same pase?

( No, it is not 10 seconds)

Did you get the answer?*When I reach the 5 th tree I cover 4 trees.**So,time taken to cover 4 trees is 5 seconds.**So, time taken to cover 1 tree is 5/4 seconds.**When I reach the 10 th tree I cover 9 trees.**So, time taken to cover 9 trees( and this is same as the time taken to run down the whole street) is 9 multiplies 5/4 **ie 45/4**or***11.25 seconds**

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lol, I always hated math !