There are 3 children in a family: Alice, Bob, and Charlie. Alice is older than Bob, and Bob is older than Charlie. If Alice is also younger than Bob’s mother, how old is Bob’s mother relative to Charlie?

Two cars are on the same highway, 100 kilometers apart, heading toward each other at a speed of 50 km/h each. A bird starts at the front of one car and flies towards the other car at a speed of 75 km/h. Upon reaching the other car, the bird turns around and flies back toward the first car, continuing this pattern until the two cars collide. How many kilometers does the bird travel before the cars meet?