tolong dijawab memakai cara!

1) 13.30+3/4
=13.30+01.45
=15.15
2)13.45+25
=13.70=14.10
15.20-14.10
=01.10
3)20.35-2 1/4
=20.35-02.15
=18.20
4)90°
5)15 m/s=0,00015 km/jam