Question

lets walk bit faster :add question tag

Answer 1

here is your answer.......
(Q) lets walk bit faster.
(A) shall we walk a bit faster?

Answer 2

The answer is Can we walk a bit faster?

Here not only we have added a question mark in the sentence and converted it into an interrogatory sentence, without changing the meaning.

In fact the question is set in a way that the sentence becomes the answer of the question.

From instructive sentence, it is converted into an interrogative sentence.