Chapter 2 - Kinematics: Description of Motion - Learning Path Questions and Exercises - Exercises - Page 60: 6

The nurse has an average speed of $0.17\,\mathrm{m/s}.$

Total distance traveled, $d=25+25=50\,\mathrm{m}$. Total time taken, $t=0.5+4+0.5=5\,\mathrm{min}=300\,\mathrm{s}$. Average speed, \begin{align*} s&=\frac{d}{t}=\frac{50}{300}\\&=0.17\,\mathrm{m/s} \end{align*}