Answer
$H_{o}$: μ = 42.6 minutes, $H_{a}$: μ > 42.6 minutes
Work Step by Step
We want to judge whether the amount of daily time spent on phone calls and answering/writing email has increased. In this case, our null hypothesis is that the mean time is 42.6 minutes, while the alternative hypothesis is that the mean time is greater than 42.6 minutes.
