70% of it is 40 minutes
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1680
As 40 minutes = 40x60 = 2400
70 % of 2400 seconds = 70/100x2400=1680
1680 seconds = 28 minutes
As 40 minutes = 40x60 = 2400
70 % of 2400 seconds = 70/100x2400=1680
1680 seconds = 28 minutes
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