Question: 1 currently the mom is 24 years older than her...
1. Currently, the mom is 24 years older than her son. After two years, she will become twice as old as her son. What is the current age of the son?
2. A bicycle rider starts from A to B along a straight line. He was riding at 20km/h for the first half journey and 30km/h for the rest. What was his average speed?