Question 981961
Wind speed is 3 mph.
r, Alfonso's rate when no wind.
t, time for specific what he "found".


______________________speed__________time_________distance
withWind______________r+3_____________t____________48
againstWnd____________r-3_____________t____________30



Uniform Travel Rates Rule:  RT=D,
T=D/R


The times for with and against wind are the same t.
{{{highlight_green(48/(r+3)=30/(r-3))}}}
Solve for r.