1. If a worker works for you for 7 days, his reward is a gold bar, but you must give him a gold bar at the end of each day. If you are only allowed to break the gold bar twice, how do you pay the worker? 2. The white snake is 80 feet long. It was driven by the monk Fahai with magic and entered the cave at the speed of 15 / 2 feet in 5 / 14 days. However, the White Snake and he are not reconciled. Its tail grows at the speed of 11 / 4 feet in 1 / 4 days. Now I ask you: how many days does it take for the white snake to enter the cave? (to be listed)

1. If a worker works for you for 7 days, his reward is a gold bar, but you must give him a gold bar at the end of each day. If you are only allowed to break the gold bar twice, how do you pay the worker? 2. The white snake is 80 feet long. It was driven by the monk Fahai with magic and entered the cave at the speed of 15 / 2 feet in 5 / 14 days. However, the White Snake and he are not reconciled. Its tail grows at the speed of 11 / 4 feet in 1 / 4 days. Now I ask you: how many days does it take for the white snake to enter the cave? (to be listed)

2. Crawling speed: 15 / 2 △ 5 / 14 = 21 feet / day
Growth rate: 11 / 4 △ 1 / 4 = 11 feet / day
Tail entry speed: 21-11 = 10 feet / day
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