Question 827156
The rate goingTo and the time goingTo are unknown, and all other quantities are either known or described in relation to the unknown variables.


Let r = rate GoingTo, and t = time in hours GoingTo the picnic.



WhichWay________rate______time__________distance
GoingTo__________r__________t___________60
Returning________r+9______t-1/3_________60


The main rule about uniform rate, travel or movement is r*t=d, r for rate, t for time, d for distance.


EQUATIONS:

GoingTo:  {{{rt=60}}}
ReturningFrom:  {{{(r+9)(t-1/3)=60}}}
'
Two equations in two unknown variables.  You take the rest of the work.