A boat covers 32 km upstream and 40km downstream in 8 hours while it covers 40km upstream and 32 km downstream in 8.5 hours. What is the velocity of current?
Let the speed of upstream be x km/hr Speed of downstream = y km/hr 32/x + 40/y =8 ………….(i) 40/x + 32/y = 8.5…………………….(ii) Adding (i) and (ii), we get 72 (1/x + 1/y) = 33/2 …………..(iii) Subtract (i) from (ii), we get 8 (1/x - 1/y) =0.5 …………..(iv) Adding (iii) and (iv), we get 2/x = 33/144 + 1/16 2/x = 42/144 x = 48/7 km/hr Now, 7/48 - 1/y = 1/16 y= 12 km/hr Now, rate of current = 1/2 (12 - 48/7) = 18/7 km/hr
Statements:
A < L ≤ P > D; F > W = P > S ≥ T
Conclusion:
I. S > L
II. F ≥ A
Statement: F < G; H ≥ I; H ≥ K; I > G ≥ J
Conclusion:
I. G > K
II. K > J
Statements:K < L,L ≥ M,M > N
Conclusions: I. K < M II. N > K
Statements: O ≥ M > F, K ≤ J ≤ D = F, B ≤ Z ≤ L = K
Conclusion:
I. M > L
II. D ≥ B
Statements: L < M > P ≥ Q; N > O > M
Conclusions:
I. N ≥ Q
II. O > L
III. L = Q
Which one the following symbols should replace the question mark in the given expression, in order to make the expressions M ≤ J as well as O > L ...
Statement:M = C ≥ A = V < Q = S
Conclusions:
I. M ≥ V
II. A < S
Statements:
P ≥ Q = R; S = T ≤ U ≥ P
Conclusion:
I. R < S
II. T ≤ Q
Which of the following symbols should replace the sign (@) respectively in the given expression in order to make the expression P ≥ O and D > K defin...
Statements: J < K = L ≥ M ≥ P; F ≥ K < G
Conclusion I. J < G II.F ≥ P
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