EM-2590

Rate and average speed

E Math · Secondary 4 · Medium · Rate and average speed

A rectangular tank of length 50 cm and width 30 cm is filled with water at a constant rate. It takes 15 minutes to fill the tank to a depth of 45 cm. Assuming the depth increases linearly, what is the depth of water after 5 minutes?

$15\text{ cm}$
$9\text{ cm}$
$30\text{ cm}$
$45\text{ cm}$

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