CAT Exam Numerical Ability Averages

If x and y are even integers, then the no of solutions of x^2-y^2=7389746232

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CAT Other Question

A watch salesman strated his day with 11 identical watches. During the first hour of the day, he visited exactly 4 people and sold at least one watch. In how many ways could he have sold the watches during the first hour of the day? A man left X for Y and another man left Y for X at the same time. After reaching their destinations, they turned back without stopping.They crossed each other at a point 30 KM from X on their onward trip and 20 KM from Y on their return trip. Find XY.

The answer is 70, please help with the approach. Thanks.