Roberto Q. answered 10/11/19
Math Tutor for 4th grade to college level
The average speed is the speed that will travel the same total distance in the same time.
therefore we need to find the total travel distance first. and divide the result by 3 hours
(total time travel)
velocity = distance/ time there for distance = velocity (time)
distance= 40(2) = 80 km
distance= 60(1)= +60 km
-----------------
add to find total = 140 km
average (speed)= 140 km/ 3 hours = 46.66 km/h
lets prove the this average speed will travel the same distance (140km ) in the same time. (3 hours)
distance =velocity (time) , distance =46.66 km/h (3 hours) = 140 km with this answer we prove
that average (speed) = 46.66 km/h is the correct answer.