a man climbs up a hill of the height of 3 km in 4 hours but he comes down by the same route in 2 hours .what is the average speed for the entire journey?
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Answer:
1.125 km/h
Step-by-step explanation:
Our aim is to find the average speed for the entire journey.
Let s be the speed.
We know that he first climbed up 3km in 4 hours, hence the average speed when going up was distance divided by time, this is:
s = d/t = 3 / 4 = 0.75 km/h.
When going down, he made the same 3 km but in 2 hours. Thus we have that
s = 3 / 2 = 1.5 km/h
Since, we want the average speed of the entire journey, we do the average of the two above values of speed.
Then,
(0.75 + 1.5 ) / 2 = 1.125 km/h
Hence, the average speed for the entire journey was 1.125 km/h
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