Question 1063671
Let s be Jerri's speed in still air, and w be the speed of the wind. Then:
s+c-10=s-c
2c=10
c=5
Then, to find out her speed in still air:
24/s+5 + 24/s-5=2
24(s-5)+24(s+5)=2sē-50
2sē-48s-50=0
sē-24s-25=0
(s-25)(s+1)=0
s=25 or -1
Throwing out the negative result from the answer, we get Jerri's speed in still air as 25 mph; therefore, her speed against the wind is 25-5, or 20 mph. ☺☺☺☺