Question answer bhej dio tha na ki

Solution 
Let the speed of rowing in still water = x km/hr
Let the speed of current = y km/hr
Speed in downstream = (x + y) km/h
Speed in upstream = (x - y) km/h
Therefore, ATQ,
Time taken to cover 20 km downstream = 2 hrsdistancespeed = 220x + y = 2x + y = 10                 .....1Time taken to cover 4 km downstream = 2 hrsdistancespeed = 24x - y = 2x - y = 2                 .....2adding 1 and 2, we get2x = 12 x = 6Put x = 6 in 1, we get6 + y = 10y = 4So, speed of rowing in still water = 6 km/hspeed of current = 4 km/h
Option (a) is correct. 

  • -1
What are you looking for?