Here's the answer:
“我们走快一点儿吧”
(wǒmen zǒu kuài yìdiǎn'r ba)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- wǒmenzǒukuàiyìdiǎn'rba
- wǒ men zǒu kuài yì diǎn'r ba
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 91.12% of the time!