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A boat travels 32 km downstream in 4 hours and 24 km upstream in 6 hours. What is the speed (in km/hr) of boat in still water?
  • a)
    2
  • b)
    4
  • c)
    6
  • d)
    8
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A boat travels 32 km downstream in 4 hours and 24 km upstream in 6 hou...
Let u be speed of boat in still water and a be speed of current.
Speed downstream = u + a
Speed upstream = u – a
Distance travelled upstream = 24 km
⇒ 24 = (u – a) × 6 ⇒ u – a = 4   ----(1)
⇒ (u + a) × 4 = 32 ⇒ u + a = 8   ----(2)
Adding (1) and (2)
⇒ 2u = 12
∴ u = 6 km/hr
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A boat travels 32 km downstream in 4 hours and 24 km upstream in 6 hours. What is the speed (in km/hr) of boat in still water?a)2b)4c)6d)8Correct answer is option 'C'. Can you explain this answer?
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