What is the Average speed?

Question

Eric cruises around in his new pickup truck for 2 hours at 40 km/h then for another hour at 60 km/h. What is his average speed?

Answer 1

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

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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.