How can 4 people cross the bridge in 15 minutes?

In the dark, four people including Hue, Hoa, Hong and Hang had to cross the bridge.

To avoid falling into the river, they needed torches to light the way, but the four of them only had one torch and it only lit for the last 15 minutes.

How do people cross the bridge at night?

Hue can cross the bridge in 1 minute, Hoa needs 2 minutes, Hong needs 5 minutes, and Hang takes 8 minutes to cross the bridge.

Only 2 people can cross the bridge at a time and if they cross the bridge together, both must go at the speed of the slower person. So how can all four cross the bridge in 15 minutes?

Please share your answer in the comment box below.

Trung Temple

Source: https://vtc.vn/bai-toan-hoc-bua-lam-the-nao-4-nguoi-cung-qua-cau-trong-15-phut-ar837934.html