GRE Exam Numerical Ability Boats and Streams

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

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GRE Other Question

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 A family consisting of one mother, one father, two daughters and a son is taking a road trip in a sedan. The sedan has two front seats and three back seats. If one of the parents must drive and the two daughters refuse to sit next to each other, how many possible seating arrangements are there?