Question 184851
<pre>
            SPEEDS      IME                 DISTANCES

BUS           b         80/b                180

CAR         b+6        112/(b+6)             112
</pre>
{{{80/b=112/(b+6)}}}


{{{80(b+6)=112b}}}

{{{10(b+6)=14b}}}

{{{5(b+6)=7b}}}

{{{5b+30=7b}}}

{{{30=2b}}}

{{{highlight(b=15)}}}-------speed of the bus.

Car goes 21 kilometers per hour.