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Chem question.IGCSE

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Guys can anyone help me with question 3 in paper 32 oct 2010 chemistry 0620? HOW DID THEY GET THE AVERAGE REACTION RATE FOR ALL THE GIVEN DATA?
 
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Guys can anyone help me with question 3 in paper 32 oct 2010 chemistry 0620? HOW DID THEY GET THE AVERAGE REACTION RATE FOR ALL THE GIVEN DATA?
they took the diff between the volume of oxygen and divided it with the diff between the time i.e (70-48)/(40-20)=1.1
 
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Guysss ! In electrolysis, when the remaining solution is an acid or a base where is it depostited? Cathode or anode? There are questions in paper 1 ...
 
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