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.
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.16 min × 70 \frac{m}{min} = 1120 mto the library.