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MGSM / 约翰以每小时 60 英里的速度开了 3 小时,然后掉头,因为他意识到自己把非常重要的东西忘在家里了。他尽量在 4 小时后赶到家,但前 2 个小时都消耗在堵塞的交…

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约翰以每小时 60 英里的速度开了 3 小时,然后掉头,因为他意识到自己把非常重要的东西忘在家里了。他尽量在 4 小时后赶到家,但前 2 个小时都消耗在堵塞的交通中了。在接下来的半个小时,他以每小时 30 英里的速度驾驶,然后在 4 小时剩下的时间里,才能以每小时 80 英里的速度行驶。4 个小时结束后,他距离家还有多远?

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