2 sentences for 一头 (yī​tóu — simultaneously)

1. 他一头走路，一头想事情。

   tā yī​tóu zǒu​lù, yī​tóu xiǎng shì​qing.

   He was walking and thinking at the same time.

   Source: Dong Chinese Dictionary

2. 那个学生一头吃着面包，一头忙着写作业。

   nà​gè xué​sheng yī​tóu chī zhe miàn​bāo, yī​tóu máng zhe xiě zuò​yè.

   That student was eating bread while busy doing his homework.

   Source: Dong Chinese Dictionary