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15. D. 15 orang
= 40 = 55
= 55 - 40
= 15 org
16. D
17. 01.15 - 01.05 = 10 menit
1 menit = 6 derajat
10 menit = 6 x 10
10 menit = 60 derajat
jd sudut yg terbentuk 60 derajat
semoga membantu ya^^