exam Maths Puzzle Numerical Ability

A large grain silo is to be constructed in the shape of a circular cyclinder with a hemisphere attached to the top. The diameter of the silo is to be 30 feet, but the height is yet

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it takes a barge 1 hour to travel 8 miles downstream with the current and 4 hours to return against the current. Find the speed of the barge in still water and the speed of the cur An achitect is bulding a model of a bulding.How tall should the modle if the actual bulding is 175ft talll and the scale factor is 1:70