A can construct a wall in 40 min and B can construct the wall in 45 min. How many hours is needed to contruct a wall if both the person working together.
","rationale_html":"A's one minute work = 1/40
B's one minute work = 1/45
(A+B)'s one minute work = 1/40 + 1/45 = 85/40*45 = 17/360
so, (A+B)will do work together in 360/17 min = 21 3/17 minutes
21 min approximately
D
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