One third of the time a pedestrian walked at a speed of 3 km / h. The rest of the time is at a speed of 4.5 km / h
| February 17, 2021 | education
One third of the time a pedestrian walked at a speed of 3 km / h. The rest of the time is at a speed of 4.5 km / h. What is the average walking speed?
Suppose that for the first part of the path a pedestrian covered 3 km, then for the second part of the way, which is 2 times longer, he covered 4.5 * 2 = 9 km.
Let’s calculate the average speed of a pedestrian.
(3 + 9): 3 = 12: 3 = 4 km / h.
Answer: average speed is 4 km / h.
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