Riddle: If you have two hourglasses -- one four-minute timer and one seven-
minute timer, how can you measure nine minutes?
minute timer, how can you measure nine minutes?
Answer: Turn over both hourglasses at once.
When the four-minute hourglass runs out, turn it over.
When the seven-minute hourglass runs out, turn it over.
When the four-minute timer runs out this time (eight minutes have
elapsed), the seven-minute hourglass has been running for one
minute. Now turn over the seven minute timer back over. When the
timer runs out, nine minutes have elapsed.
When the four-minute hourglass runs out, turn it over.
When the seven-minute hourglass runs out, turn it over.
When the four-minute timer runs out this time (eight minutes have
elapsed), the seven-minute hourglass has been running for one
minute. Now turn over the seven minute timer back over. When the
timer runs out, nine minutes have elapsed.
Share:
Halloween Riddles are hand picked Halloween Riddles for use by teachers in the classroom and for home school lessons. This halloween riddles quiz provides the option to be downloaded as a PDF or printable directly from the Halloween Riddles quiz page.
Thanksgiving Riddles are hand picked Thanksgiving Riddles for use by teachers in the classroom and for home school lessons. This thanksgiving riddles quiz provides the option to be downloaded as a PDF or printable directly from the Thanksgiving Riddles quiz page.
Christmas Riddles are hand picked Christmas Riddles for use by teachers in the classroom and for home school lessons. This christmas riddles quiz provides the option to be downloaded as a PDF or printable directly from the Christmas Riddles quiz page.
