C+W = 5hrs 30 min ---(1) C+C = 5 hrs 30 min - 2 hrs 30 min = 3 hrs 2C = 3 hrs So C = 1hr 30 min ---(2) By equation (1) & (2), we will get, W = 5 hrs 30 min - 1 hr 30 min = 4 hrs So W+ W = 4+4 = 8hrs
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