Chef and the Website

Chef runs a very busy cooking website. He has hired you as his data analyst. One particular day, Chef's website is visited $N$ times by $N$ distinct people. For the $i$th visit, you have the start time of the visit as $S_i$ and end time of the visit as $E_i$ given in terms of seconds passed since the start of that day. You need to answer $Q$ of Chef's question. In the $j$th question asked by Chef,