Question
A boat covers 30 km downstream and 18 km upstream in a
total of 6 hours. If the speed of the stream is 2 km/h, then what is the speed of the boat in still water?Solution
ATQ, Let speed of boat in still water = x km/h Downstream speed = x + 2 Upstream speed = x - 2 Given, 30/(x + 2) + 18/(x - 2) = 6 Try option x = 8: 30/10 + 18/6 = 3 + 3 = 6 So, x = 8 km/h Hence, the correct answer is 8 km/h.
If 'E & N # O' is true, then how is E related to K?
‘W + X’, means ‘W is the sister of X’
‘W - X’, means ‘W is the daughter of X’
‘W × X’, means ‘W is the brother...
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How N is related to Q?
If Q is the granddaughter of T, which of the following is false?
‘M $ K’ means ‘M is the mother of K’.
‘M # K’ means ‘M is the father of K’.
‘M @ K’ means ‘M is the husband of K’....
Answer the questions based on the information given below.
B $ C means ‘C’ is the husband of ‘B’
B @ C means ‘C’ is the moth...
A $ B' means 'A is the mother of B'. 'A % B' means 'A is the wife of B'. 'A @ B' means 'A is the sister of B'. 'A # B' means 'A is the son of B'. If 'T ...
( A $ B ) means A is father of B, ( A % B ) means A is brother of B, ( A @ B ) means A is wife of B. If K @ I $ J % G @ H $ F , then, which of the follo...
