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Since the unit rate of the baker baking the bread per hour is 46,the baker bakes 46 loaves an hour.
X^2 -5x -20=0
(x - 5/2)^2 -20 -25/4=0
(x-5/2)^2-105/4=0
(x -5/2 -(105)^1/2)(x -5/2 +(105)^1/2)=0
factors are (x -5/2 -(105)^1/2) and
(x -5/2 -(105)^1/2)
Your answer is 6
Explanation so
L=15
W=4
D=2
15x4=60
60x2=120
Then you use 120divide it by 20 (per hour) and your answer is 6hours