42. A boat can be rowed 9 km. upstream or
18 km. downstream in a period of 3 hrs. What is the
speed of the boat in still water in km/hr?
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Answered by
1
Answer:
8km/hr is the answer for this I hope
Answered by
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The speed of boat in still water = 9/2 Km/hr
Time taken by boat to row 9 Km upstream = 3 hours
Velocity of the boat upstream = 9/3
= 3 Km/hr
Time taken by boat to row 18 Km upstream = 3 hours
Velocity of the boat upstream = 18/3
= 6 Km/hr
Let the velocity of boat in still water be v and the velocity flow of river be u.
Velocity of boat upstream = velocity in still water - velocity of water
=> 3 = v - u -----(1)
Velocity of boat downstream = velocity in still water + velocity of water
=> 6 = v + u -----(2)
Solving the equations (1) and (2) we get v = 9/2 Km/hr and u = 3/2 Km/hr.
Speed of boat in still water = 9/2 Km/hr
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