tolobg dijawab karena besok mau dikumpul

kecepatan = jarak / waktu
v = s / t

s = v . t
s = 90km/jam x 60 menit
s = 90 km/jam x 1 jam
s = 90 km

t = s / v
t = 90 / 70
t = 1 2/7 jam

1 2/7 jam = 1 2/7 x 60 = 77,14 menit

77.14 menit semoga membantu