Answer:
A. 78 km/h
B. 9.75 km/l
C. 64.28571 km /h
Step-by-step explanation:
2.5 hours, drove 195 km, used 20 liters for whole journey
A. avg speed
speed = distance / time
speed = 195 km / 2.5 hours
speed = 78 km per hour
B. gasoline consumption rate in km/l
rate = kilometers / liters
rate = 195 km / 20 l
rate = 9.75 km/l
C. avg speed of 110 km/h for 45 mins, what is avg speed for remaining part?
distance = speed * time
distance = 110 km/h * 0.75 h
distance = 82.5 km
total distance = 195, 195-82.5, he has 112.5 km left to go for the trip
105 minutes left (2.5*60 - 45 = 105)
speed = distance / time
speed = 112.5 km / 1.75 h
speed = 64.28571 km /h
