20) A plane has a speed of 840 km/h in still air. It can travel 3120 km with the wind in the same time it would take to travel 1920 km against the wind. Find the speed of the wind. 21) Cecilia is 24 years younger than Joe. Six years ago she was half as old as he was. How old is each now? 22) Two years ago, Rick's age was 1 year less than twice Barbara's age. Four years from now, Rick will be 8 years more than half Barbara's age in four years. How old is Rick now?

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