Mam can you please explain me this question

Dear student,
As per the number line representation, TR= RS = SU. Now we can see that these three parts exists between -2 and -1 so they are equally divided into three parts. Similar case is for AP= PQ = QB between 2 and 3. Now matching it with the number line specifications they have found values of each point. Next, you need to just write the down the values for P, Q, R and S. 
I hope you understand the explanation now. Fir any further queries feel free to get back to us!
Regards

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