a) Yesterday evening, my journey home took 25% longer than usual. By what percentage was my average speed reduced compared to normal? b) By what percentage would I need to increase my usual average speed in order for the journey to take 20% less time than usual?
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
Junior Mathematical Olympiad 2007 (2007)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →Junior Mathematical Olympiad 2007 (2007)