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Rate downstream = 6/8 x 60 = 45 km/hr Rate upstream = 36/4 = 9 km/hr Speed of current = 1/2 (Rate downstream – Rate upstream) ⇒ 1/2 (45 – 9) km/hr = 18 km/hr
Among A, B, C, D and E, seated in a straight line, facing North, who sits exactly in the middle of the line?
How is B related to C?
I. C and D are the sons of E. B is son of E’s father.
II. E is sister of B and mother of D, who is brother of C.
Seven boxes H, I, J, K, L, M and N are kept one above another in a stack from bottom to top. How many boxes are kept between K and I?
Who among P, Q, R, S and T is tallest?
I. S is taller than only 2 people and R is taller than P.
II. P is not shorter than S.
Six persons M, N, Q, W, T and Y are arranged according to their height. Find the second shortest person.