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20 hours because the fast clock technically gains 3 minutes every hour. An hour has 60 minutes, so if you divide that by 3 you get 20.

Q: I started my two clocks at the same. one is slow and loses 2 minutes every hour the other one is fast and gains 1 minute every hour. how long will it take for the faster clock to be 1 hour ahead?

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If that's "a quarter to," it means fifteen minutes before the hour; the minute hand on the 9.

60 minutes for hours

So you can tell the minute. STANDARD!

The answer to the question, as worded, depends on out of how many minutes Jacob had 5/12 remaining. If you assume it was out of 1 minute, then Jacob was faster.

At 0 minutes, turn both the hourglasses.After 4 minutes:The 4 minute hourglass: 0 minutes left.The 7 minute hourglass: 3 minutes left.Turn the 4 minute hourglass.After 7 minutes:The 4 minute hourglass: 1 minute left.The 7 minute hourglass: 0 minutes left.Turn the 7 minute hourglass.After 8 minutes:The 4 minute hourglass: 0 minutes left.The 7 minute hourglass: 1 minute left.Turn the 7 minute hourglass.After 9 minutes:The 4 minute hourglass: 0 minute left.The 7 minute hourglass: 0 minutes left.Now you know you are finished.

Related questions

Minute hand.

If that's "a quarter to," it means fifteen minutes before the hour; the minute hand on the 9.

Clocks have 0, 2 or 3 hands: 0 (digital clocks), 2 (hour and minute), 3 (hour, minute and second).

60 minutes for hours

They have clocks on the game. It depends on what time you set it as. It usually goes really fast- about 30 minutes for every minute in real time.

clocks got minute hands for the first time in 1680.

Analog clocks have an hour hand and minute hand, and 12 numbers around a circle.

The plural of minute is minutes.

So you can tell the minute. STANDARD!

A Leap Minute is a minute that is added or removed according to what's needed to keep our clocks and calendars in synch with the movement of our planet and the sun. The movement of the Earth around the Sun, and around its own axis, doesn't match up exactly to our clocks and calendars. To prevent the error from growing year after year, Leap days, leap hours, leap minutes, even leap seconds, are regularly added to keep everything in synch.

Start both sand clocks off at the same time. When the 7-minute clock runs out turn it over. When the 11-minute clock runs out turn it over. START TIMING. When the 7-minute clock next runs out it will have been 3 minutes.

The answer to the question, as worded, depends on out of how many minutes Jacob had 5/12 remaining. If you assume it was out of 1 minute, then Jacob was faster.