Book Maths Puzzle Logical Reasoning

Next door to me livfour brothers of different heights .Their average height is 74 inches, and the difference in height among the first three men is two inches. The difference between the third and fourth men is six inches.
Can you tell how tall is each brother?

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Book Other Question

A.B AND C are three pipes such that a and b are inlet ones and can fill a tank in 12 and 6 mins . C is a pipe which can work either as an inlet or as an outlet pipe taking 24 mins to fill or emty as the case may be. If C and A and C and B wok alternatively for 1 min each .The tank gets filled in 10 mins.Find the time for which the C work as an outlet The ratio of the perimeter of an equilateral triangle having an altitude equal to the radius of a circle, to the perimeter of an equilateral triangle inscribed in the circle is????