Expert: Richard J. Raridon - 5/14/2010

Question
1) Martin leaves 10 kilometers from school. If he rides his bike at 12 kph and leaves the school at 2:00 pm, what time will he reach home?

2) A car leaves a gasoline station at 60 kph. How long will a second car traveling at 75 kph to catch the first car if it leaves the same station 1 hour later?

3)Two cars leave two towns that are 230 kilometers apart at the same time, traveling directly to each other. One car travels 15 kilometers per hour slower than the other. They pass one another 2 hours later. What are their speeds?

If you can't answer all, maybe one answer will help a lot. Thanks!
btw, I'm 14 , sophomore

Answer
1) time = distance/velocity so t = 10/12 = 5/6 hr or 50 minutes so he arrives at 2:50
2) distance = velocity times time so D = 60t = 75(t-1) and t = 5 hours
3) let v = slower speed so 2 = x/v = (230-x)/(v+15) giving you v = 50kph and the other car is going 65kph