the duration from 1 o'clock to 2 o'clock - 60 minutes, the duration from 2 o'clock to 5 o'clock - 3 hours, the duration from 2.30 to 3.00 - 30 minutes, the duration from 5.15 to 6 c'clock - 45 minutes, the duration from 7.40 to 8.00 - 20 minutes, the duration from 7 o'clock to 9 o'clock - 120 minutes,

Maths Duration

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