Question

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28. A trough is 6 m long and its ends have the shape of isos-
celes triangles that are 1 m across at the top and have a height
of 50 cm. If the trough is being filled with water at a rate of
1.2 m³/min, how fast is the water level rising when the water
is 30 centimeters deep?
goal:
dh
dt

relative rate

Answer 1

醜B

來