Your question is Time and Measurement Puzzles. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
If you have a 7-minute hourglass and an 11-minute hourglass, how can you boil an egg in exactly 15 minutes? You have a 3 gallon jug and 5 gallon jug, how do you measure out exactly 4 gallons?