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Let the speed of boat in still water be 'v' km/h. ATQ, 48/(v + 4) + 48/(v - 4) = 5 Or, 48 X (v - 4 + v + 4) = 5 X (v2 - 16) Or, 48 X 2v = 5v2 - 80 Or, 5v2 - 96v - 80 = 0 Or, 5v2 - 100v + 4v - 80 = 0 Or, 5v(v - 20) + 4(v - 20) = 0 Or, (5v + 4) (v - 20) = 0 So, 'v' = 20 or 'v' = - (4/5) But speed cannot be negative. So, 'v' = 20 Upstream speed of boat = 20 - 4 = 16 km/h Therefore, upstream distance cover by boat in 150 minutes = 16 X (150/60) = 40 km
Select the option that is related to the fifth number in the same way as the second number is related to first number and the third number is related to...
Statements:
Only a few Rolex are Fastrack.
Only a few Rolex are Titan.
Only a few Timex are Fastrack.
Conclusions:
...Figure A is related to B following a certain pattern. Following the same pattern, figure C is related to D. Study the pattern and select the figure whi...
Select the option that is related to the fifth letter-cluster in the same way as the second letter cluster is related to the first letter cluster and th...
Five marbles named as A1, K1, P1, R1, and T1 are kept one above the other (not necessarily in the same order). Only marble T1 is between K1 and P1. P1 i...
Select the related number from the given alternatives:
13 : ? :: 12 : 1729
Select the set in which the numbers are related in the same way as are the numbers of the following set.
(12, 27, 21)
Find the odd word pair out from the given options.
