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dalam 5jam = 5x60 /15 = 20 kali
a = 30
r= 2
ditanya = u21 (20 kali pembelahan)
u21 = ar^20
= 30 x 2^20
= 30 x 1.048.576
= 31.457.280
5 jam= 300 mnt / 15= 20x30=600