Answer:
[tex]750cm/hour[/tex]
Step-by-step explanation:
Sidney's speed: [tex]180m/24hours[/tex]
Sidney's average speed per hour: [tex]180m\div24/24hours\div24 = 7.5m/hour[/tex]
Because [tex]1m=100cm[/tex]
Sidney's average speed in cm per hour = [tex]750cm/hour[/tex]
Hope this helps :)