Determining Rate of Reaction

In the reaction between limestone powder(calcium carbonate) hydrochloric acid, 17 cm3 of carbon dioxide that produced is in 3.5 minutes. 
Average rate of reaction is 17 cm3/3.5 min

But, during the second minute, only (12.5 - 7.5) cm3 of carbon dioxide gas released in 1 minute time, 

Average rate of reaction during the second minute is

(12.5 - 7.5) cm3 / (2 - 1) min 

The correct answer is : C

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