3. Alexis and her little sister began biking at the same time in the same direction from Grinnell on RAGBRAI. Alexis rode 15 miles per hour, but her sister could only ride 12 miles per hour. When will
they be 10 miles apart?

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)