Question
"The boat's downstream and
upstream speeds are 18 km/hour and 12 km/hour, respectively. A boatman takes 16 hours to cover (p + q) km upstream when the stream's speed is doubled. What is the average of p and q?"Solution
ATQ, Let, speed of boat in still water and stream speed be x km/hour and y km/hour, respectively. So, (x + y) = 18 … (i) Also, (x – y) = 12 … (ii) Solving equation (i), and (ii), we get, x = 15 km/hour y = 3 km/hour According to question, (p + q)/(x – 2y) = 16 (p + q) = 16 × (15 – 2 × 3) = 16 × 9 = 144 km Therefore, average value of p and q = (p + q)/2 =144/2 = 72 km
N is the father of P. O is the only son of H, who is married to N. Z is married to Y, who is the child of H. How is Z related to N?
K is the son of G. H is the father of K. F is the brother of G. E is the father-in-law of H. How is D related to F, if D is the wife of K’s mother’s...
Who is the brother of I?
In a family of six members, P is married to Q. R is Q's sister, and S is R's father. T is S's mother. How is T related to P?
____ is father-in-law of ____.
How is P related to L?
Pointing to a photograph, a girl tells Umesh “I am the only daughter of this lady and her son is your maternal uncle.” How is the speaker related to...
Ketan is father of Mehul’s brother. How is Ketan related to Mehul?
How is S related to T?
N is brother of O. O is brother of P. M is father of N. Q is son-in-law of M. How is P related to M?
