Yun Xi didn't want to talk to Han Yaotian during the ride, so she used Zhao Yumo shamelessly, discussing chemical formulas and biological gene chains with her.
Yun Xi was very shrewd. She knew that Zhao Yumo, as well as being an heiress from a prominent family, was very smart.
So the two of them spent the whole time while they were riding with Han Yaotian purposely talking about things he didn't know anything about. They didn't choose to discuss something like mathematics that could be linked to his work, nor did they choose a subject such as Chinese or English, topics that would allow him to join in the conversation.
Zhao Yumo chose subjects such as chemistry and biology, especially because Yun Xi excelled in them.
The two of them stayed deep in discussion, as if no one else was around and Han Yaotian had merely been their chaffeur.