No.9 tolong pakai cara

v = s/t
40 = 20/t
t = 20/40
t = 1/2 jam = 30 menit

07.45 + 00.30
= 07.75
= 08.15

W= jarak dibagi kecepatan=
20/40×60= 30 menit
07.45+30 menit= 08.15

Maaf kalo salah