Two ropes are coated in oil and can be burnt. Each rope takes exactly one hour to fully burn, but they burn at an inconsistent rate.
How do you measure 45 minutes using these two ropes? You only have a lighter and the two ropes (no other equipment is provided). Both ends of the rope can be lit.
Email your answer to Paris Suksmith/Aarit Bhattacharya/Zach Marinov. Good luck!