Let's represent:
Time = T
Number of gallons = G
T ∝ G
T = kG
T = 0.2 minutes
G = 0.5 gallons
0.2 = 0.5 x k
0.2 = 0.5k
To solve for k, we divide both sides by 0.5
0.2/0.5 = 0.5k/0.5
k = 0.4
Therefore, the constant of proportionality is 0.4
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