MAths

maybe have some correction here..And i' m not sure..either my answer is right or no..

1. a)s=d over t
   =260km over 3 1/3
   =260km over 10/3
   =260km divide by 10/3
   =260km x 3/10
   =78km/h
   
   b) s=d over t
   =418km over 2h 45mins
   =418km over 2 45/60 h
   =418km over 2 3/4h
   =418km over 11/4
   =418 divided by 11/4
   =418 km x 4/11
   =152km/h
   
2. a) s=d/t
   =14.5km over 50mins
   =14.5km over 50/60h
   =14.5 over 5/6
   =14.5 divided by 5/6
   =14.5 X 6/5
   =87/5
   =17.4 km/h
   b)s=d/t
   =14.5km over 5omin
   =14.5 x1000/ 50x60
   =14500/3000
   =4 5/6 m/s
   
3. a) d=s x t
   =60km x 2h 15 min
   =60km x 2 15/6o h
   =60km x 2 1/4h
   =60 x 9/4
   =135 km
   
   b) t=d/s
   =280/60
   =4 2/3 h
4. a) d=s x t
   =18km/h x 90min
   =18km/h x 90/60 h
   =18 km/h x 9/6 h
   =18km/h x 1 1/2h
   =18km x 3/2
   =27km
   
   b)s=d/t
   =6km over 45min
   =6km over 45/60 h
   =6km over 3/4h
   =6 divided by 3/4
   =6 x 4/3
   =8km/h
   
   c) s=d/t
   =33km over 135min
   =33km over 135/60 h
   =33km over 2 1/4 h
   =33km over 9/4 h
   =33 divided by 9/4
   =33 x 4/9
   =132/9
   =14 2/3 km/h