Question
The downstream and upstream speeds of a boat are 36 km/hr
and 28 km/hr, respectively. If the boatman covers (x + y) km upstream in 8 hours while the stream flows at double its usual speed, find the average of x and y.Solution
ATQ,
Let, speed of boat in still water and stream speed be B km/hour and s km/hour, respectively.
So, (B + s) = 36 … (i)
Also, (B – s) = 28 … (ii)
Solving equation (i), and (ii), we get,
B = 32 km/hour
s = 4 km/hour
According to question,
(x + y)/(B – 2s) = 8
(x + y) = 8 × (32 – 2 × 4) = 8 × 24 = 192 km
Therefore, average value of x and y = (x + y)/2 = 192/2 = 96 km
If 'A @ B' means 'A is the daughter of B'. 'A & B' means 'A is the husband of B'. 'A % B' means 'A is the wife of B'. 'A $ B' means 'A is mother of B'....
If "G @ P & I % W & V # Q & K * M" is definitely true, then how is W related to K?
Statements : R < Q ≤ T > S = V, D < F ≤ Q
Conclusions : I. T > D II. F < R
‘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...
If F & G $ I @ H % J is true then how is F related to J?
'A@B' means 'A is the father of B'. 'A#B' means 'A is the sister of B'. 'A$B' means 'A is the brother of B'. 'A%B' means 'A is the wife of B'.
If...
'A # B' means 'A is the mother of B'. 'A & B' means 'A is the spouse of B'. 'A % B' means 'A is the sister-in-law of B'. If F # E, D & F, B % F, A & C #...
‘A × B’ means ‘A is the brother of B’.
‘A − B’ means ‘A is the mother of B’.
‘A ÷ B’ means ‘A is the father of B...
In expression ‘X $ U & V @ P # Q % R $ S & T’ who is the only daughter of V?
If L is mother of M’s father then which of the following is true?