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pic?

|dw:1433040585514:dw|
I'm not sure though...

|dw:1433040673042:dw|

oh, okay

I think just take distance/ velocity = time

The 12km/h, is going negative?

how?

I remember something about -12km/h from my teacher, but I'm not sure though.

hey still stuck on this

|dw:1433045913122:dw|

or we know b' and d ... and can determine b either way

b=3?

|dw:1433046508888:dw|
???

Given dx/dt =12km/h, find dz/dt=? when z=5km
x^2+y^2=z^2
(2x)(dx/dt)+(2y)(dy/dt)=(2z)(dz/dt)
???

May the answer be 36/5=dz/dt??

36/5 looks good!

My teacher said something about -12km/h, but dont know why...

Should it be -36/5km/h?? hmmm... :/

yes, because the distance between lighthouse and boat is reducing

What do you mean?

in the diagram the boat is approaching near to the light house, yes ?

yes

since the distance is decreasing, the velocity is negative

i have a debt of $100
is same as saying
i have -$100

Oh I see! Thanks lots!