" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Cari KPKlampu merah = 7 detik
lampu hijau = 2 detik
lampu biru = 4 detik = 2² detik
KPK = 2² x 7 = 4 x 7 = 28 detik
waktu = 7 menit = 420 detik
frekuensi lampu nyala bersamaan = 420 detik / 28 detik
= 15 kali