Going down the river a boat went 12 km/h. going up the river it only went 2 km/h. what is the speed of the current? how fast would the boat go if there were no current?

try 10 km/h as the base speed

Step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!