On a certain day, Mabel asked her domestic helper to record the starting time and ending time of her 9-year-old son Charles routine and activities in the afternoon.<br>Charles completed 9 Mathematics questions while doing his homework that day.<hr>If he had spent the same amount of time on each question, he took <input min="0" type="number" id ="imp3pg208q5_1" class="lineinput" placeholder="?" /> minutes to complete each question.