Jonathon and samantha row their canoe 26 miles downstream in 2 hours. after a picnic, they row back upstream. after 3 hours they only travel 15 miles. assuming that they canoe at a constant rate and the river's current is constant, find the speed at which jonathon and samantha can row in still water.

9 mph

Step-by-step explanation:

Given

During downstream it took 2 hr to cover 26 miles

During upstream it took 3 hr to cover 15 miles

Let v be the canoe velocity and be the stream velocity

thus

------1

and

--------2

From 1 & 2 we get

2v=18

v=9 mph

  q

step-by-step explanation:

each line from a vertex to the midpoint of the opposite side is called a median. the point where the medians intersect, point q, is the centroid.

the centroid of δabc is point q.