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The change on horizontal distance (y) is 0

|dw:1435204741155:dw|

Oops I'm sorry. It's 240
Since (35+25)*4=240
The speeds add up since they go in opposite directions

The two boats can never be moving at a rate more than 70km/h away from one another.

I'm afraid there are other mistakes, if the idea is clear, just forget about the final numbers

Right, I don't quite understand [t(35+25)] this part.. i mean the logic behind it

Ahh okay, so using Pythag we always know the distance between the two boats...

't' being the time passed in hours.
Distance^2 = 100^2 + [(35+25)t]^2

|dw:1435206276856:dw|

Derp! YES
It is 60... hah!

Ohhh right! Now I get it! I totally forgot about the formula d=vt

That makes sense now

Be careful u forgot about many things Tracy ,just like me :P
Good luck

Yep! You are solving for v in this problem.

|dw:1435206409506:dw|
So in fact, we are using pythag for this black triangle right?

Exactly!

My pleasure! Good luck on the test!

Thanks! :D