Posted by **kayla** on Tuesday, January 27, 2009 at 6:11pm.

you have a 5 minute hourglass and a 9 minute hour glass. How can you use them to time a 13 minute barbeque?

- math, psychology, puzzle -
**bobpursley**, Tuesday, January 27, 2009 at 6:14pm
Start both at the same time. When the 5 min is done, you have 4 min left on the larger glass, start the bbq. When that hourglass is done, flip it over for the next nine min.

4+9=13

## Answer This Question

## Related Questions

- Math for Liberal Arts - You have a 5 minute hour glass and an 8 minute hour ...
- math - tell how many minute have passed and how many degree the minute hand has...
- Math - If a valid time on a 12 hour time period has the hour hand and minute ...
- math - write and evaluate an expression for the total cost of a 17 minute long ...
- maths - the minute hand of a clock is 9cm long. the hour hand clock is 2/3 times...
- Geometry (math) - The 100-foot clock tower in Rome, Georgia is more than 100 ...
- Math - What is 9 kilometers per hour converted into feet per minute? A. about 1...
- math - raquel teaches dance classes each evening starting at5:380p.m. she ...
- math!!! - can you please check my work 19mm=? m ?=.19??? .017km=? cm ?=1700? ...
- Math - Which Is More Correct? A Watch That Doesn't Work At All Or A Watch That ...

More Related Questions