Total time = number of laps × average time.<br><br>
• Total time for 9 laps = 9 × 45 = 405 s<br>
• Required total for 10 laps at 44 s average = 10 × 44 = 440 s<br>
• Time for 10th lap = 440 − 405 = 35 s<br><br>
Final Answer: 35 s