Question 1156688
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From the condition, you have these 3 equations


    A + B + C = 3700    (1)

    A + B     = 2200    (2)

    A     + C = 2400    (3)


To find C, from equation (1) subtract equation (2) :  C = 3700-2200 = 1500 gallons per hour.


To find B, from equation (1) subtract equation (3) :  B = 3700-2400 = 1300 gallons per hour.


To find A, substitute the value of B= 1300 into equation (2)

    A + 1300 = 2200,  which gives you  A = 2200 - 1300 = 900 gallons per hour.
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Solved.