First we convert the ten minutes into seconds. Since there are sixty (60) seconds to the minute, we get : 10 minutes x 60 seconds per minute = 600 seconds

Mathise gave us the information that a lock will fill or empty 90 000 cubic metres of water in those 600 seconds. So we will divide the amount of water moved by the time, to get the rate of flow in cubic metres per second.

90 000 m³ / 600 seconds = 150 m³ per second

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