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**ship P**is travelling due

**East at 30 km/h**and a

**Ship Q**is travelling due

**South at 40 km/h.**

Both ships keep constant speed and course.

**At t=0 they are each 10 km**from the point of intersection of their courses and moving towards the point.

Iv found the

**co-ordinates**of

**Q relative to P at t=0**

---->

**X=(10,10)km**

iv also found the

**velocity**of

**Q relative to P**----> V= V[Q] -V[P]

-----.V= (0,40) - V(30,0)

----- V= (-30,40)km/h

but im struggling to find the

**time at which P and Q are closest to each other**...is there anyone that can help??? thankz