Systems of Two Equations... Word Problems

I've been struggling on how to set up these two word problems. The first one is a mixture problem while the second is about motion; I believe.

1) In order for coffee to be labeled "Kona Blend," it must contain at least 30% Kona beans. Bean Town Roasters has 40 lb of Mexican coffee. How much Kona coffee must they add if they wish to market it as Kona Blend?

2) Natalie jogs and walks to school each day. She averages 4 km/h walking and 8 km/h jogging. From home to school is 6 km and Natalie makes the trip in 1 hr. How far does she jog in a trip?

Thanks in advance.