It took him 2.6 hours to reach the top
Data;
- Uphill = 6km
- Downhill = 4km
- Total time taken = 8 hours
<h3>Speed</h3>
Let us calculate the speed during uphill and downhill
Since the time it took them to descend is twice the time it took them to ascend,
- Let x represent the time taken to ascend

From the calculation above, it took him 2.6 hours to reach the top.
Learn more on speed here;
brainly.com/question/4931057
1. Integer
2. Rational Number
3. Rational Number
4. Whole number
5. Rational Number
Let me know if these are correct. Correct if I’m wrong I don’t want to give wrong answers
Answer:
1. 
2. not completely sure but i think its 
3.x
=
2
i
√
5
,
−
2
i
√
5
4.x
=
−
9
±
√
73
/2
5. Im not sure...
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The correct answer is -15 because the absolute value is 15 but there is a negative outside the absolute value lines making it negative :)