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## Homework Statement

At 9 a.m ship A is 50 km [E] of ship B. Ship a is sailing [N] at 40 km/h and ship B is sailing

## Homework Equations

x^2 + y^2 = z^2

dz/dt [t=3h] = ?

db/dt = 30 km/h

da/dt = 40 km/h

## The Attempt at a Solution

My instructor made me draw out a diagram

the diagram helped me determine that dy/dt = 70 km/h and that x = 50 km

so: x^2 + y^2 = z^2

50^2 + y^2 = z^2

2y(dy/dt) = 2z (dz/dt)

2y(70) = 2z (dz/dt)

Not sure if i'm doing this right/what to do next.