hello i'm new to things like these and I need your help guys:

two construction companies make bids of X and Y on a remodeling project.The joint p.d.f of X and Y is uniform on the space 2<x<2.5 2<y<2.3

If X and Y are within 0.1 of each other,the companies will be asked to rebid; otherwise the lower bidder will be awarded the contract.

What is the probability that they will be asked to rebid?

I have no idea can you give me at least a guide or hint?

Thank you