science

Are you smarter than a 12-year-old? #1

cryotosensei

- The bakery is right between Hong’s house and Jeya’s house.
- The library is 120 m closer to Jeya from the bakery.
- Hong had to cycle to the bakery and then 120 m more.
- Jeya had to cycle 120 m less than the way to the bakery.
- Hong cycled 2×120 m = 240 m more than Jeya.
- They both arrive at the same time, so Hong cycling $$15 \frac{m}{min}$$ faster enabled her to cycle 240 m more. Per $$\frac{240 m}{15 \frac{m}{min}} = 16 min$$, we learn that Hong and Jeya cycled for 16 minutes.
- In 16 minutes, Jeya cycled $$16 min × 70 \frac{m}{min} = 1120 m$$ to the library.