10 hours 20 minutes
620 - 20 = 600 = 60 x 10
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620 PM -- 40 minutes 620 AM -- 12 hours, 40 minutes
10 hours 20 mins
11 hours and 25 minutes.
There are 10 minutes and 20 seconds in 620 seconds
Dividing distance travelled by speed gives 620/52 = 11.923076 recurring (that is, 11. 923076923076...) hours. This is approximately equal to 715 minutes.