what steps would i do for this?

Question

An Austin Mini and a Nissan Maxima leave an intersection in Kingston at the same time.

The Austin Mini, driven by Jackie, travels south at 80 km/h, and the Maxima, driven by Josh,

travels cast at 90 km/h. Al what rate is the distance between the two cars changing 30

minutes later, assuming they can continue to travel at the given initial speeds?

Answer 1

The cars are traveling at right angles to each other.

Therefore the distance between them is the hypotenuse of a right triangle.

The legs of the triangle are 80t and 90t, where t is the time in hours.

What is the hypotenuse? and how fast is it growing?

Answer 2

d = √(90t + 60t)

Now determine d / dt.