Answer:
10 mph
Step-by-step explanation:
speed of boat in still water = x
speed of current = 5
speed of boat with current (downstream) = x + 5
speed of boat against current (upstream) = x - 5
distance downstream = 9
distance upstream = 3
time = t
speed = distance/time
distance = speed × time
downstream:
9 = (x + 5)t
upstream:
3 = (x - 5)t
9 = xt + 5t
3 = xt - 5t
9 = xt + 5t
-3 = -xt + 5t
-----------------
6 = 10t
t = 0.6
9 = (x + 5)0.6
15 = x + 5
x = 10
Answer:
I think it is triangular prisim
A list of cube roots between 100 and 600 are
5x5x5= 125
6x6x6=216
7x7x7=343
8x8x8=512
The interior triangles are similar, so the following ratio should hold true:
9 x
--- = ------ then x^2=144 and x=12 (answer)
x 16
