I've had difficulties finding problems that I worked on and when I have the answer I can't find the problem.
Can you help me identify these problems?
3 circles touch tangentially with diameters 3, 2, and 1. Find the radius of the largest circle that can be drawn in the space formed by the 3 circles.
Train leaves Canberra for Sydney at noon. Another leaves Sydney for Canberra forty minutes later. If each travel at the same rates taking 3 1/2 hours, what time do they meet?
Please identify these problems. Thanks.