1. An airplane flying east at 300 km " passes over an airport 10 minutes before a second airplane flying south at 420 km passes over the same point. Assuming that both the airplanes are at the same altitude, at what time is the distance between them a minimum? [5 marks) ;hmire 2. What are the dimensions and area of the largest rectangle that can be placed inside a semicircle (half a circle) of radius 8? [6 marks] 3. A piece of window framing material is 6 m long. A carpenter wants to build a frame where there is a framed equilateral triangle on top of a rectangle (see diagram - you will need six pieces of frame). What are the dimensions for the six pieces so that the maximum amount of light will be admitted? Scanned with CamScanner