It is impossible to slice a triangular pyramid with a plane and get a quadrilateral cross section.
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Answer:
Step-by-step explanation:
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We will use distance formula which states:
where 'd' is the distance, 'r' is rate or speed and 't' is time taken.
So,
Let 'u' be the speed of boat in still water.
A person rows 14 miles downstream to the fishing spot.
So, the speed of boat downstream = (u+6) mph
Time taken by boat to go downstream = hr
He rows 2 miles upstream from the fishing spot.
So, the speed of boat upstream = (u-6) mph
Time taken by boat to go upstream = hr
Since, The person took same amount of time in going downstream and then going upstream.
So,
Cross multiplying, we get
u = 8
So, speed of boat in still water is 8mph.
Now, Time taken in going downstream =
=
= 1 hr
Now, Time taken in going upstream =
=
= 1 hr
So, total time taken to cover 16 miles is 2 hours.