Driving his wife to work one morning, Sam encounters heavy traffic, and his average speed is only 20 mph. After dropping his wife at her office, he returns home along the same route at an average speed of 40 mph. What was his average speed for the entire trip? Express your answer as a mixed number.
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Answer:
30 mph
Step-by-step explanation:
Since we are given
The First average speed at what sam travels is 20mph.
therefore let us consider Average Speed for First trip (V1) = 20mph
The Second average speed at which sam travels is 40mph.
therefore Average speed for second trip (V2) = 40 mph
Average speed for the entire trip = (V1 + V2)/2
= (20 + 40)/2
= 60/2
= 30 mph
Therefore the average speed of sam for the entire trip is 30 mph.
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