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katak dapat naik = 3m/jam
katak turun=2m/jam
jadi dalam 2 jam katak hanya naik 1 meter.
20m/1m x 2 jam = 40jam!
sorry kalo salaah
1 meter dicapai 2 jam
selama 1 jam = 1 meter jadi 20 meter dapat dicapai selama 10 jam