Question
A boat has a speed of 30 m/s in still water. When moving
upstream, its speed is reduced by 16(2/3) % compared to its still water speed. If the speed of the stream increases by 60% and the boat's speed in still water increases by 40%, determine the total time required for the boat to travel 680 meters downstream and then return 680 meters upstream.Solution
Speed of boat in still water = 30 m/c
So, upstream speed of boat = 30 X (5/6) = 25 m/s
So, speed of stream = 30 - 25 = 5 m/s
Increased speed of stream = 5 X 1.6 = 8 m/s
Increased speed of boat in still water = 30 X 1.4 = 42 m/s
So, Required time = {680/(42 + 8) } + {680/(42 - 8) }
= 13.6 + 20 = 33.6 = 33.6 sec
- Arshi is mother of Rekha. Sunita is sister-in-law of Rekha. Tapan is maternal grandfather of Girish. Anuj is son of Puneet. If Arshi is mother of a son and...
How is Z related to X?
Z is grandson of T, who is not mother of W. Y is wife of W, who is father of Z. S is mother of V, who is brother of W. How is T related to V?
If 'A - B' means 'A is the mother of B', 'A @ B' means 'A is the sister of B', 'A # B' means 'A is the husband of B', 'A & B' means 'A is the son of B',...
E + F means E is daughter of F. E - F means E is husband of F. E × F means E is sister of F. E ÷ F means F is father of E. If L + M – N + O × P –...
Neelam, who is Rohit’s daughter, says to Indu, “Your mother Reeta is the younger sister of my father, who is the third child of Sohan ji.” How is ...
- A is uncle of B who is son of D, but D is neither brother nor sister of A. A’s father is husband of L. L’s daughter H is mother of F. How is L related ...
‘A + B’ means 'A is mother of B’, ‘A – B’ means 'A is brother of B', ‘A ÷ B’ means 'A is father of B’, ‘A × B’ means 'A is h...
- Arshi is mother of Rekha. Sunita is sister-in-law of Rekha. Tapan is maternal grandfather of Girish. Anuj is son of Puneet. If Arshi is mother of a son and...
Study the following information carefully to answer the given questions below-:
If ‘A + B’ means ‘A is father of B’, ‘A – B’ mean...
