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11.]Diana = 1 ⁵/₁₂ jam = 60 menit + 25 menit = 85 menit
Ratna = 1 jam 45 menit = 60 + 45 = 105 menit
Selisih = 105 - 85 = 20 menit
12.]
Mira = 25 menit 36 detik = (25 × 60) + 36 = 1536 detik
Siska = 27 menit 30 detik = (27 × 60) + 30 = 1650 detik
Selisih = 1650 - 1536 = 114 detik
13.]
Dona = 2 jam 15 menit 30 detik = (2 × 3600) + (15 × 60) + 30 = 8130 Detik
Doni = 1 jam 45 menit 25 detik = 3600 + (45 × 60) + 25 = 6325 Detik
Maka kalau mereka berdua membaca adalah :
1/Total = 1/Dona + 1/Doni
1/Total = 1/8130 + 1/6325
Total ≈ 3557,4 Detik