It takes a duck 40 days to fly to the south during winter, twice as much time to fly to the north during summer, and 60 days to travel to the East during spring. How many days is the duck flying during these seasons? Think carefully first, then make a decision:
If the duck takes 40 days to fly to the south during winter and twice as much time to fly to the north during summer, it takes 40 * 2 = 80 days to travel to the north. The total time it takes to travel to the south and the north during both seasons is 80 + 40 = 120 days. The duck also takes 60 days to travel to the East during spring, making the total time it travels during all the seasons to be 120 + 60 = 180. So, the answer is 180.