--- title: Catching up — a lesson of Mova's school · trees and pragmatics description: «Catching up», a lesson of the lessons course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: When a faster traveller chases a slower one going the same way, the gap shrinks by the difference of the speeds every hour. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/lessons/164-catching-up/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Lessons](https://md.mova.elamur.ai/free/en/corpora/school/lessons/) / Catching up # Catching up Lesson 164 of the lessons course of Mova's primary school: 4 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). - [0](https://md.mova.elamur.ai/free/en/corpora/school/lessons/164-catching-up/0/) — When a faster traveller chases a slower one going the same way, the gap shrinks by the difference of the speeds every hour. - [1](https://md.mova.elamur.ai/free/en/corpora/school/lessons/164-catching-up/1/) — A bus at 40 km an hour leaves 3 hours before a car at 60 km an hour. - [2](https://md.mova.elamur.ai/free/en/corpora/school/lessons/164-catching-up/2/) — The bus is 40 × 3 = 120 km ahead. - [3](https://md.mova.elamur.ai/free/en/corpora/school/lessons/164-catching-up/3/) — The car gains 60 − 40 = 20 km each hour, so it catches the bus after 120 / 20 = 6 hours. - ← previous: [Moving towards each other and moving apart](https://md.mova.elamur.ai/free/en/corpora/school/lessons/163-meeting-and-moving-apart/) - next →: [Working together](https://md.mova.elamur.ai/free/en/corpora/school/lessons/165-working-together/) - ↑ back to [Lessons](https://md.mova.elamur.ai/free/en/corpora/school/lessons/)