Answer: D) Any one pair of A and B, B and C or C and A is sufficient Explanation: Let distance between A & B = d kmLet speed in still water = x kmphLet speed of current = y kmph from the given data,d/x = 2 From A) we get dFrom B) we get d/x+yFrom C) we get y   So, Any one pair of A and B, B and C or C and A is sufficient to give the answer i.e, the speed of upstream.

Answer: B) Crabs Explanation:

Answer: D) 1 Explanation: What is Dipole :   when two atoms in a molecule have substantially different electronegativity: One atom attracts electrons more than another, becoming more negative, while the other atom becomes more positive.

Answer: C) Romans Explanation: Romans (753 BC - AD 410) began public health and sanitation systems.   Romans established the first public health and sanitation systems by building sewers and aqueducts. They also treated diseases with diet, exercise and meditation.

Answer: D) A wildlife management agency Explanation: A wildlife management agency sets hunting regulations in most states.     These agencies will have regular meetings where the public can voice their concerns and make suggestions. Hunters wishing to propose changes to the regulations should participate in these meetings or join a hunting organization that interacts with the agency.

Answer: D) borders Explanation: There are different colors that are used for different signs on the maps. The typical color standard for topographic maps depicts contours in brown, bodies of water in blue, boundaries in black, and grids and roads in red. Topographic maps may use different colors to represent area features.   Black represents man-made objects or cultural features like roads, bridges, borders, etc...

Answer: D) a person who balances social, physical, and mental health Explanation: A person who balances all the three healths such as Physical, mental and Social healths has the best overall health.

Answer: D) a, b & c follows Explanation: All locks are bangles + All bangles are cars = A + A = A= All locks are cars => Some cars are locks.Hence conclusion (a) follows.All keys are locks + All locks are bangles = A + A = A= All keys are bangles => some bangles are keys.Hence conclusion (b) follows.All keys are bangles + All bangles are cars = A + A = A= All keys are cars => Some cars are keys.Hence conclusion (C) follows. Thus all a, b and c follows.