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ibps-rrb-oa 2021 Β· Question 26 of 55

The distance between two points A and B is 24 km. A boat travels from A to B and come back in six hours. If speed of stream is increases by 2 km/h, then boat takes six hours to travels from A to B in upstream. Find the speed of boat in still water?

  1. A(a) 6 km /h
  2. B(b) 9 km /hCorrect
  3. C(c) 5 km /h
  4. D(d) 7 km /h
  5. E(e) 10 km /h

Answer: B. (b) 9 km /h

Explanation

Let the speed of boat in still water and speed of stream are x km/h and y km/h. = 6 π‘₯βˆ’π‘¦βˆ’2 π‘₯βˆ’π‘¦= 6 ……..(i) 24 24 ( π‘₯+𝑦+ 6 ) = 6 π‘₯+𝑦= 2 π‘₯+ 𝑦= 12… … (𝑖𝑖) From (i) and (ii), π‘₯= 9 π‘˜π‘š /β„Ž

Source: IBPS RRB Clerk Mains Previous Year Paper 2021 (Questions) - BankersAdda Β· memory-based

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