CAT Exam Numerical Ability Area and Volume

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.

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CAT Other Question
If x and y are even integers, then the no of solutions of x^2-y^2=7389746232 when N is divided by X the remainder is 28. When N is divided by 10X the remainder is 125. What will be the remainder when N is divided by 5X.