nomor 1 75 menit= jam nomor 2 540 detik= menit

75 menit = 75/60 jam
=1 15/60 jam
= 1 1/4 jam
540 detik = 540/60 menit
9 menit

nomor 1.
1 jam = 60 menit
= 75:60
= 1,25 jam

nomor 2
1 menit = 60 detik
= 540:60
= 9 menit