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Marathon Mission

Stage: 3 Short Challenge Level: Challenge Level:2 Challenge Level:2
See all short problems arranged by curriculum topic in the short problems collection

After a year's training, Minnie increased her average speed in the London Marathon by $25\%$.

By what percentage did her time decrease?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.  

This problem is taken from the UKMT Mathematical Challenges.