英语智力题a hare and a tortoise are racing.Theya hare and a tortoise are racing.They should cover a distance of 2,000m.the tortoise walks at a speed of 25 m per minute,while the hare can run at a speed of 325 m per minute.But the hare thinks he runs much faster than the tortoise,and he has a sleep during the way to the end.As a result,when the tortoise arrives the hare may have 400 m to go.Question:How many minutes does hare sleep?

问题描述:

英语智力题a hare and a tortoise are racing.They
a hare and a tortoise are racing.They should cover a distance of 2,000m.the tortoise walks at a speed of 25 m per minute,while the hare can run at a speed of 325 m per minute.But the hare thinks he runs much faster than the tortoise,and he has a sleep during the way to the end.As a result,when the tortoise arrives the hare may have 400 m to go.Question:How many minutes does hare sleep?

翻译:龟兔赛跑,赛程2000m。乌龟每分钟跑25m,兔子每分钟跑325m。但是,兔子自大,途中睡了一觉。最终,当乌龟到达终点时兔子离终点还有400m。问题:兔子睡了多长时间?
答:
乌龟用时:2000/25=80分钟
兔子跑步用时(2000-400)/325=64/13
睡觉用时 80-64/13=976/13=75.0769........分

2000/25-(2000-400)/325≈75minutes