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20 x (3hours + 20minutes) = 60hours + 400minutes = 60hours + 6hours + 40minutes =

66hours 40minutes

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Another approach:

3hours + 20minutes = 180minutes + 20minutes = 200minutes

20 x (200minutes) = 4,000minutes =

3,600minutes + 360minutes + 40minutes = 60hours + 6hours + 40minutes =

66hours 40minutes

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12y ago

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