GRE Exam Numerical Ability Ratio and Proportion

40% of a 2:3 solution of substance A and substance B is replaced with substance B. Which of the following is/are true?
A. The concentration of substance B increases
B. The concentration of substance A remains the same
C. The ratio of A to B becomes 1:3
D. The ratio of A to B becomes 5:11
E. The ratio of A to B becomes 6:19

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GRE Other Question
A triangle has its vertices at A(0,1), B(5,2) and C(-7,-7). Which of the following statements is/are true?
A) AB>BC B) BC>AC C) Angle A > angle B D) Angle C > angle E) AB is the longest side A boat takes 6 hours to go downstream and takes 8 hours to go the same distance upstream. The speed of the stream is 6 km/hr. Which of the following is/are true? Indicate all correct options.
A) Speed of the boat upstream is 42 km/hr
B) Speed of the boat downstream is 48 km/hr
C) Distance travelled one way is 288 km
D) Distance travelled one way is 28 km
E) Speed of the boat in still water is 42 km/hr