Question 857331
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Hi,
first solve for Distance each traveled
t = D/r
 {{{x/75kmph = (405-x)/60kmph}}}  | Cross Multiplying to solve for x
   75(405-x) = 60x
   75*405- 75x = 60x
        {{{75*405/135}}} = x = 225km,   
{{{225km/75kmph = 3hrs}}}
In 3hrs they will be 405 kilometres apart?