tolong yiaa dijawab dengan cara yang lengkap terima kasih. semangatt...

11.
a. 25 m/s = 1.500 m/mins
= 90.000 m/h
= 90 km/h

b. 120 m in 10 s
125 : 10 = 12,5 m/s = 750 m/mins = 45.000 m/h = 45 km/h

c. 95 m in 6 s
95 : 6 = 15,8 m/s = 948 m/mins = 56.880 m/h = 57,88 km/h

d. total distance = 125 + (25 × 20) + 95 = 720 m

total time = 10 + 20 + 6 = 36 s

720 : 36 = 20 m/s = 1.200 m/mins = 72.000 m/h = 72 km/h

12.
a. 54 km/h = 0,9 km/mins
in 40 mins, the distance is 36 km

remaining distance = 120 - 36 = 84 km
remaining time = 80 mins

84 km in 80 mins
84 : 80 = 1,05 km/mins = 63 km/h

b.
-the return journey (2h 10mins = 130 mins)
120 km in 130 mins
120 : 130 = 0.9 km/mins = 54 km/h

-the whole trip
total distance = 120 × 2 = 240 km
total time = 120 + 140 = 250 mins
240 km in 250 mins
240 : 250 = 0.96 km/mins = 57,6 km/s