20. Jarak = 400 m

Waktu = 2 menit

K = J / W

= 400 m / 2 menit

= 0,4 km / 1/30 jam

= 0,4 km x 30/1 jam

= 12 km/jam { C }

1. 2 ¾ = 11/4

1 1/3 = 4/3

3,15 = 63/20

= 4/3 x 63/20

= 252/60

= 252/60 + 11/4

= 252/60 + 165/60

= 417/60

= 6 57/60

2. 2 2/4 = 2 1/2 = 5/2

1,5 = 15/10 = 3/2

= 5/2 - 3/2

= 2/2 = 1

3. = 3/4 : 4/5

= 3/4 x 5/4

= 15/16

= 1 1/16

4. J = K x W

= 50 km/jam x 1,5 jam

= 50 km/jam x 3/2 jam

= 50 x 3 = 150

= 150 : 2 = 75

= 75 Km

5. W = J / K

= 725 km / 125 km/jam ( km dicoret )

= 5,8 jam

= 5 jam 48 menit

= 07.15 + 5 jam

= 12.15 jam + 48 menit

= 13.03