Tolong jawab h sampe j pake cara ya

h. 180 mnt= 3jm
     10800 dtk= 3jm
180 mnt + 10800 dtk = 6 jam
i.240 mnt= 4 jm
7200 dtk = 2 jam
240 mnt + 7200 dtk = 6 jam
j.20 mnt= 1200 dtk
2 jm = 7200 dtk
20 mnt + 2 jm = 8400 detik

Semoga terjawab...