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n = 3000
t = 1/4 jam = 15 menit = 900 detik
ditanya : frekuensi (f)
f = n/t
f = 3000/900
f = 3,33 Hz
f = 3000 : (1/4 x 3600)
f = 3000 : 900
f = 3.333 Hz