Question
A boat can cover 90 km upstream and 225 km downstream in
15 hours. Speed of the stream is how much less than the speed of the boat in still water if the boat can cover 72 km upstream and 180 km downstream in 12 hours?Solution
ATQ, Let the upstream speed and downstream speed of the boat be x km/h and y km/h, respectively. So according to question: 90/x + 225/y = 15 ………………. (i) Also, 72/x + 180/y = 12 ……….. (ii) Solving (i) and (ii), we get x = 18 and y = 36 So, the upstream speed and downstream speed of the boat are 18 km/h and 36 km/h, respectively. Speed of the boat in still water = (18 + 36)/2 = 27 km/h Speed of the stream = (36 – 18)/2 = 9 km/h So, the desired difference = 27 – 9 = 18 km/h
'A & B’ means ‘A is the sister of B’.
‘A – B’ means ‘A is the mother of B’.
‘A × B’ means ‘A is the husband of B’...
IF 'NOISED' is coded as 'PRMQBZ', how will ‘GARDEN’ be coded as in the same code?Â
Statements:
All blacks are white.
Only a few whites are red.
No red is yellow.
Conclusions:
I). Â Some whites ar...
If point P is exactly in the middle of points Y and R, then what is the direction of point S with respect to point P?
Which letter cluster will replace the question mark (?) to complete the given series?
RJXU, ZANB, ?, PITP, XZJWÂ
If it was Sunday on 1st April, 1956, then what was the day of the week on 2nd July, 1957?
Select the letter cluster from among the given option that can replace the question mark (?) in the following series.
SRHF, QTFH, OVDJ, MXBL, ?
Odd one out
A series is given with one term missing. Select correct alternative from the given ones that will complete the series.
JWIG, ODCY, TKWQ, YRQI, ...
Three of the following four options are alike in a certain way based on the Alphabetical series. Which one among the following doesn’t belong to the g...
Relevant for Exams:
