Arthur D. answered 04/04/16
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15.6 kl of water
1 kl=1000 l
15.6*1000=15,600 l of water
15,600/20=780 minutes
780/60=13 hours
8:30 am plus 4 hours brings you to 12:30 pm
12:30 pm plus 9 hours brings you to 9:30 pm