3/5 jam + 4/5 menit + 60 detik = ... menit

=3/5×60 +4/5+1
=180/5+0,8+1
=36+0,8+1
=37,8 menit

3/5jam=3/5×60=36menit
60 detik=1menit
36menit+1menit=37menit
4/5+37×5/1×5=4/5+185/5=189/5menit

~maaf kalau jawabannya salah^^