1-12 per 5 jam tambah 3 per 4 menit ... detik

1 jam = 3. 600 detik
1 menit = 60 detik

12
1-----
5
= 17/5 jam = 17× 3. 600÷5=61, 2 ÷5=12, 24 detik

3
----- menit
4
= 3/4 menit = 3×60=120 detik

12, 24 + 120 =132, 24 detik