Tolong dong jawab serincinya

V(kecepatan) = 60km/jam
t(waktu)= 40 menit atau ⅔jam
s(jarak) = v × t = 60 × ⅔ = 40km

v = 80km/jam
s = 40km
t = s : v = 40 : 80 = ½jam atau 30menit