Question 1140123
<pre>
               SPEED       TIME       DISTANCE

speedboat         2r        x-1        240

yacht             r          x         150
</pre>

{{{highlight_green(150/r-240/(2r)=1)}}}-------solve to find speed of speedboat.

-

{{{150/r-120/r=1}}}

{{{30/r=1}}}

{{{highlight(r=30)}}}
and you should be able to find the other three asked quantities from this.