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#### DeusAbscondus

##### Active member

- Jun 30, 2012

- 176

Main question:

Could someone take a look at my working out, attached as geogebra screenshot, for the following problem:

If the time taken from A to B is given by

$$T=\frac{\sqrt{100^2+x^2}}{3}+100-\frac{x}{5}$$

find a value for x which minimizes time taken for the journey.

Thanks,

deusabs