Question
The speed of a boat while moving downstream is 80% higher
than its speed while moving upstream. If the boat covers a distance of 720 km downstream in 20 hours, determine the speed of the boat in still water.Solution
ATQ;
Let speed of the boat in still water and speed of stream be ‘x’ km/h and ‘y’ km/h, respectively.
Downstream speed of the boat = (x + y) km/h
Upstream speed of the boat = (x – y) km/h
Downstream speed of the boat = (720/20) = 36 km/h
ATQ,
(x + y) = 36 ------- (I)
And, 36 = 1.8 × (x – y)
Or, (x – y) = 20 -------- (II)
By adding equation (I) and equation (II), we get
x = 28
Therefore, speed of boat in still water = 28 km/h
What is the position of box X with respect to box S?
Which of the following combination is definitely correct?
Who among the following lives immediately above F who lives in the same type of flat as F?
Four of the following five are a like in a certain way based on the given arrangement and thus form a group. Which is the one that does not belong to th...
Which of the following is true regarding box P?
How many persons live between L and Y?
Statements:
No Boat is Stream
Some Cruise are Captain
All Captain are Boat
Conclusion:
I. Some Cruise are not ...
What is S’s profession?
Six boxes D, E, F, G, H and I are kept one above another. The bottommost box is numbered as 1 and the topmost box is numbered as 6. D is three boxes bel...
- Six boxes (S, T, U, V, W, and X) are kept one above another such that the bottommost box is numbered as 1 and the topmost box is numbered as 6 but not nece...
