⭐Hola User______________
⭐Here is your Answer..!!
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↪Actually welcome to the concpet of the Rate of change of any Quantity with respect to time. ..
↪since for general we know that ..
↪Rate of change = ( Final state - initial state )÷( final time - initial time )
↪thus ♢d = (A2 - A1) ÷ (t2 - t1)
↪applying the formula above we get as ..
↪Rate of change of water level in feet per hour =
↪======> (Water level final - Water level initial ) ÷ ( final time - initial time )
↪since here we can take any interval of time ... we choose the second and third ..
↪thus Rate = (30 - 40 ) ÷ ( 4 -2 )
↪==》 Rate = -10 ÷ 2 ==》 -5 feet/ hr
↪since the rate cannot be negative value , we take the modulus of it
↪this Rate = |-5| = 5
↪thus Rate = 5 feet / hour
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⚓#DYNAMO