A room is ^@5 \space m^@ long and ^@9 \space m^@ broad. It has one door measuring ^@2 \space m^@ by ^@1.5 \space m^@ and two windows each measuring ^@1 \space m^@ by ^@1 \space m^@. The cost of painting the walls of the room at the rate of ^@BD90^@ per ^@m^2^@ is ^@BD29880^@. Find the height of the room.
There are few taps and holes in tank. Each tap can fill empty tank in 28 minutes, while each hole can empty a full tank in 35 minutes. If there are 3 taps and 2 holes, how long would it take to fill empty tank?