<PRE><B>Question 886566</B>
r = original speed for first 63 km.


________________rate_________time_______distance
First___________r____________(___)______63
Last____________r+6_________(___)_______72
TOTAL_________________________3


Basic Rule in Uniform Rates Travel, RT=D.
Use to find T=D/R.


________________rate_________time_______distance
First___________r____________{{{63/r}}}_______63
Last____________r+6_________{{{72/(r+6)}}}_______72
TOTAL_________________________3


Solve this equation for r:
{{{highlight_green(63/r+72/(r+6)=3)}}}
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