The time spent in erecting a concrete pillar is partly constant and party varies as three times the base area. If it takes 27 hours to erect a pillar of height 15m and base area of 24 metre square and 52 hours for a pillar of height 20m and area of 48 metre square, find the time taken to erect a pillar of height 25m and area 60 metre square.?
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Asked by henry on 22nd February, 2020
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