Question

Thomas bought a train set with 25 toy engines that run at different speeds. The train set has five parallel tracks that can be built to race the engines. After each round, Thomas notes down the relative speeds of the engines instead of their actual lap times. What is the least number of races he can play before he can decide the first, second and third fastest engines?​

Answer 1

↝Hope it helps

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• he will first do five races, then he'll get winner from all of the 5 races

• Then again he' ll do the race between them and he'll get positions of horses

• Hence, it needs minimum 7 races

So, YOUR ANSWER IS 7

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hope it helps