Jawaban:

1 2/5 jam 120 detik = ... menit

Pembahasan :

Ukuran waktu

1 jam = 60 menit => 1 menit = (1/60) jam

1 menit = 60 detik => 1 detik = (1/60) menit

1 jam = 3.600 detik => 1 detik = (1/3.600) jam

1 2/5 jam

= 1 jam + 2/5 jam

= 60 menit + 2/5 × 60 menit

= 60 menit + 120/5 menit

= 60 menit + 24 menit

= 84 menit

Atau

1 2/5 jam

= 7/5 jam

= 7/5 × 60 menit

= 420/5 menit

= 84 menit

120 detik

= 120 × (1/60) menit

= 120/60 menit

= 2 menit

Jadi

1 2/5 jam 120 detik

= 7/5 jam + 120 detik

= 84 menit + 2 menit

= 86 menit

maaf kalau salah