Brain Teasers

If we know the volumetric flow rates of the water going into the two branches, then what would be the velocity of the water coming out?

Four words with the letters SNT, in that order, have all their other letters removed. You must use the letters below to fill in the blanks.
_ _ S _ N T _ _ _
S _ _ N T
S _ N _ _ T
S _ _ _ N T
Letters to use: A, A, E, E, E, I, I, L, L, Q, S, S, U, U

A 25 ft ladder (assume it is not an extension ladder) is placed with its foot 7 ft away from a building. If the top of the ladder slips down 4 ft, how many feet will the bottom slide out?

Doug had forgotten the 5 digit code to his briefcase. However, he did remember five clues: The fifth number plus the third number equals fourteen; The fourth number is one…