Solution:
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Solution:
Solution:
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.
Solution:
1. The man takes the cat across and goes back to get the mouse. 2. The man then takes the mouse across and returns with the cat. 3. The man leaves the cat on the shore and takes the dog across. He leaves the dog with the mouse. 4. The man goes back to get the cat and all of the animals have made it across the river!