Ahouse boat sailed 30 miles downstream in 3 hours and return to the same marina upstream in 5 hours. find the rate of the house boat in still water and the rate of the current in the water.

Step-by-step explanation:

The downstream speed is ...

  speed = distance/time = 30 mi/(3 h) = 10 mi/h

The upstream speed is ...

  distance/time = 30 mi/(5 h) = 6 mi/h

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The downstream speed is the sum of boat speed (b) and current speed (c):

  b + c = 10

The upstream speed is their difference:

  b - c = 6

Adding these two equations gives ...

  2b = 16

  b = 8 . . . . . boat speed is 8 mph

Then the current speed is ...

  c = 10 -b = 10 -8 = 2 . . . . . current speed is 2 mph

the probability is 0

i think the answer is b.

step-by-step explanation:

not 100% sure though.