The second one is correct
Answer: 
Step-by-step explanation:
Given: A tourist first walked 17km with a speed of v km/h.
Since 
therefore, 
Let
be the time he walked with speed v.
then 
Also he hiked 12 km uphill with the speed that was 2 km/hour less than his original speed.
Let
be the time he hiked 12 km,
Then 
The total time for the whole trip is given by:-

Substitute the values of
and
in the equation, we get

I think that would be a right angle triangle or is that not what it is meaning
Answer:
8
Step-by-step explanation:
Fill in the variable value and do the arithmetic.

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Of course, the fraction can be simplified first:
