The speed of the hare is 15 m / s, and the speed of the fly is 18 km / h. Which of them has great speed?

Let’s translate everything into the SI system and find out the speed:
Hare speed: 15m / s
Fly speed: 18 km / h = 5 m / s
15 m / s is more than 5 m / s, which means the hare is faster.
Answer: the hare is faster



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