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The animation here shows Jerry driving towards some cheese. The entire journey lasts 10 seconds. And Jerry covers 50 m in that time.

If you break up the journey, Jerry covers 5 m in the first 2 s, 10 m in the next 2 s and so on. So, in the first 2 s, the average speed is $$\frac{5 \, \mathrm{m}}{2 \, \mathrm{s}} = 2.5 \, \mathrm{m/s}$$. In the next 2 s, the average speed is is $$\frac{10 \, \mathrm{m}}{2 \, \mathrm{s}} = 5 \, \mathrm{m/s}$$
Jerry covered (i) 5 m from 0 to 2 s, (ii) 10 m from 2 to 4s and (iii) 20 m from 4 to 6 s. Which of these has the highest average speed?
• Time interval (i)
• Time interval (ii)
• Time interval (iii)
• All had equal average speeds