An athlete crosses a distance of 3600 m in 12 minutes. What is his speed (in km/h)?

15 17 18 16

18

We know , Speed = \(\frac{Distance  }{Time }\)  = \(\frac{3600 }{60  × 12  }\)  = 5 m/sec 5 m/sec = 5 × \(\frac{18 }{5}\) = 18 km/h