A. 60 min

B. 80 min

**C. 70 min (Correct)**

D. 48 min

Explanation:

1/20 – 1/28 = 1/70

70 minutes

Answering Exams

A. 60 min

B. 80 min

**C. 70 min (Correct)**

D. 48 min

Explanation:

1/20 – 1/28 = 1/70

70 minutes

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