The four walls and ceiling of a room of length 25 m breadth 12 m and height 10 m are to be painted p...........

Quantitative Aptitude (CGL) Mensuration 3D

The four walls and ceiling of a room of length 25 m, breadth 12 m and height 10 m are to be painted. painter a can paint 200 m2 in 5 days, painter b can paint 250 m2 in 2 days. if a and b work together, they will finish the job in

208/3

207/3

209/7

210/11

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Explanation:

Area of four walls and ceiling of the room
= 2(l + b) x h + l x b
= 2 x 10 (25+12) + 25 x 12
= (20 x 37 + 300)
= (740 + 300) m2
= 1040 m2
Area painted by A in 1 day
= (200/5) = 40 m2.
Area painted by B in 1 day = (250 /2)
= 125 m2
Area painted by both in 1 day
= (125 + 40) m2 = 165 m2
Required time = (1040 /165) = 208/33