Train X leaves Dhaka at 10:00 AM and travels East at a constant speed of x miles per hour. If another Train Y leaves Dhaka at 11:30 AM and travels east along the same tracks at speed 4x/3, then at what time will Train Y catch Train X?

Answer: 
4 PM same day
Train X leaves Dhaka at 10:00 AM and travels East at a constant speed of x miles per hour. If another Train Y leaves Dhaka at 11:30 AM and travels east along the same tracks at speed 4x/3, then at what time will Train Y catch Train X?