Question 278675
Please help. I am not good with word problems. I don't know where to start. 
John and Tony start from the same place and at the same time and head for a town 10 miles away. John walks twice as fast as Tony and arrives 3 hours before Tony. Find the speed of each.
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It can be done with only one unknown but I'll use two.
Hope you've had systems of equations.

       distance   rate  time
John     10        2r   t-3
Tony     10         r    t

{{{system(distance = rate*time,10=2r(t-3),10=rt)}}}

{{{system(10=2rt-6r,10=rt)}}}

Sustitute 10 for rt in the first

{{{10=2(10)-6r}}}

{{{10=20-6r}}}

{{{6r=10}}}

{{{r=10/6}}}

{{{r=5/3}}}

{{{r=1&2/3}}}

So Tony walked {{{1&2/3}}} mph

John walks twice that fast or {{{10/3}}} or {{{3&1/3}}} mph.

Edwin</pre>