book Maths Puzzle Numerical Ability

A man row a boat 24 km upstream in 3 hours and returns downstream in 1.5 hour.

(a) Find the speed of the stream
(b) Find the speed of the boat in still water

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book Other Question

how do i work out 3% solution from a 6% solution of 1.5ml hydrogen peroxide solution? please help me with this equation. If the lines represented by the equations 2y=3x+4 and y-ax-5=0 are parallel, What is the value of a?