Question 1163098
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I suspect that your question should be formulated differently :


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    |    How far will be one car from another in 20 minutes ?  |
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If so, then you have a right angled triangle.

Its legs are  {{{45*(1/3)}}} = 15 miles  and

              {{{60*(1/3)}}} = 20 hours,

and "how far" is then the hypotenuse of this right angled triangle.


So, the distance is  {{{sqrt(15^2 + 20^2)}}} = {{{sqrt(225+400)}}} = {{{sqrt(625)}}} = 25 miles.


Notice that the triangle is, actually, (3,4,5)-triangle with the legs 15 and 20 miles, 
so you can get the answer of 25 miles practically MENTALLY.
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