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During the morning rush, entering travelers can fill a station in 30 minutes. Fortunately, departing trains can empty it in 40 minutes.
rush-hour pace, how long will it take for the station to fill with travelers?​

Answer 1

One hour ten minutes

Explanation:

departing trains can empty it in 40 minutes.

entering travelers can fill a station in 30 minutes.

Time it will take travellers to fill the train

= Time for departing train + time for filling a station

= 40 minutes+ 30 minutes

= 70 minutes

= One hour ten minutes