Hello, thank you for taking the time to post your question!
The key on this type of question is finding a way to relate the quantities to one another using an equation!
On this one we have
Upstream Rate = 343 km / 7 hours = 49 km/h
Downstream Rate = 594 km / 6 hours = 99 km/h
Then if you let “B” represent the rate in still water and “C” be the rate of the current, we can set up
B – C = 49
B + C = 99
Adding those together yields
2B = 148, meaning
B = 148/2 = 74 km/h
And then to find the rate of the current you can take
C = 99 – 74 = 25 km/h
So the rate of the boat in still water is 74 km/h and the rate of the current is 25 km/h.
I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)
