6.2 Graphical methods of solution 239
for^34 hour. Over a long period, what is the
percentage of times they will coincide at
the gym?Answers and comments are on pages 334–35.4 (Harder task) Anna and Bella both go to
the gym on the same three days each
week. The gym is open from 8 a.m. to
10 p.m. and either may arrive, quite
randomly, any time between 8 a.m. and
3 p.m. Anna stays for one hour and Bella