Klahan drove 2 hours longer than Mongkut at an average speed 2 kilometers per hour faster than Mongkut. Tasanee drove 6 hours longer than Mongkut at an average speed 6 kilometers per hour faster than Mongkut. If Klahan drove 70 kilometers more than Mongkut, then how many more kilometers did Tasanee drive than Mongkut?
Som can complete some work in 10 days, while Klahan can complete the same work in 15 days. They started the work together, and when the work was half complete, Klahan fell ill and Som had to finish the remaining work. How long did it take to complete the work?
The cost of a ball is a two digit number (for example ฿xy). Its selling prices has same digits as cost with digits interchanged (฿yx). If its profit margin is divided by 9, find the remainder of division.
Kiet is getting ready for his office. He has 7 pair of black socks and 10 pair of yellow socks. he reaches into the cupboard and picks up a black sock Without looking. What is the probability that the next sock he pulls out will be of same color?
6 teams compete in a track competition. If there are 23 events in the competition, no event ends in a tie, and no team wins more than 4 events, what is the minimum possible number of teams that won at least one event?