4 of them.
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20 minutes.
One third of an hour is equivalent to 20 minutes. To find this, you first need to determine how many minutes are in an hour (60 minutes) and then divide that by 3 (60 ÷ 3 = 20). So, one third of an hour is 20 minutes.
1h and 20 minutes = 80 minutes 80 * 60 = 4800 seconds
18 minutes, 20 seconds.
An hour = 60 minutes. 20+20+20= 60. SO>>>> 2/3 of an hour = 40 minutes. Understand?