3 per 2 jam ditambah 15 menit

3/2 jam + 15 menit =
3/2 x (60) + 15 = 90 + 15 = 105 menit = 1 jam 45 menit.

3/2 jam + 15 menit
1 jam 60 menit
3/2x(60)=180:2=90
90+15=105 menit
=1 jam 45 menit