Question 911980
let her distance on the third day and distance on the first day,=x miles 

Second day she travels (146-2x)


The first day, she averaged 6mph, 
time first day = x/6

the second day 5mph,
time second day = (146-2x)/5

 and the third day 4mph. 
time third day = x/4

total time = 30 hours

x/6 + (146-2x)/5 + x/4 = 30

multiply equation by LCM 60

10x+12(146-2x)+15x= 1800

10x+1752-24x+15x=1800

x=48

x=48

first &third day 48 miles 
balance on second day


 then how many hours did she paddle each day?