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  • Question
  • A boat running upstream covers a distance of 10 km in 30 min and while running downstream, it covers the same distance in 25 min away and return, then the speed of the water current is?


  • Options
  • A. 2 km/h
  • B. 3 km/h
  • C. 1/2 km/h
  • D. 1 km/h

  • Correct Answer
  • 1/2 km/h 

    Explanation

    Speed upstream = 10 / (30/60) = (10 x 60)/30 = 20 km/h
    Speed downstream = 10/(25/60) = (10 x 60)/25 = 24 km/h
    ? Speed of the river's current = (24 - 20)/2 = 4/2 = 2 km/h


  • Boats and Streams problems


    Search Results


    • 1. 
      A boat takes 9 h to travel a distance upstream and taken 3 h to travel the same distance downstream. If the speed of the boat in still water is 4 km/h, then what is the velocity of the stream?

    • Options
    • A. 4 km/h
    • B. 3 km/h
    • C. 6 km/h
    • D. 2 km/h
    • Discuss
    • 2. 
      A boat's speed in still water is 5km/h. While river is flowing with a speed of 2km/h and time taken to cover a certain distance upstream is 2 h more than time taken to cover the same distance downstream. Find the distance?

    • Options
    • A. 10.5 km
    • B. 11 km
    • C. 10.9 km
    • D. 15 km
    • Discuss
    • 3. 
      Speed of motorboat in still water is 45 km/h. If the motor travels 80 km along the stream in 1 h 20 min, then the time taken by it to cover the same distance against the stream will be?

    • Options
    • A. 4 h 20 min
    • B. 3 h 40 min
    • C. 2 h 40 min
    • D. 2 h 55 min
    • Discuss
    • 4. 
      A boat has to travel upstream 20 km distance from point X of a river to points Y. The total time taken by boat in travelling from point X to Y and Y to X is 41 min 40 s. What is the speed of the boat?

    • Options
    • A. 66 km/h
    • B. 72 km/h
    • C. 48 km/h
    • D. Cannot be determined
    • Discuss
    • 5. 
      A motorboat can travel at 10 km/h in still water. It travelled 91 km downstream in a river and then returned to the same place, talking altogether 20 h. The rate of flow of river is?

    • Options
    • A. 3 km/h
    • B. 4 km/h
    • C. 2 km/h
    • D. 5 km/h
    • Discuss
    • 6. 
      A steamer goes downstream from one port to another in 4 h. It covers the same distance upstream in 5 h. If the speed of the stream is 2 km/h, then find the distance between the two ports.?

    • Options
    • A. 50 km
    • B. 60 km
    • C. 70 km
    • D. 80 km
    • Discuss
    • 7. 
      In a river, the ratio of the speed of stream and speed of a boat in still water is 2 : 5 Again, ratio of the speed of stream and speed of an another boat in still water is 3 : 4. What is the ratio of the speeds of the first boat to the second boat in still water?

    • Options
    • A. 10 : 7
    • B. 15 : 8
    • C. 4 : 3
    • D. 5 : 4
    • Discuss
    • 8. 
      A man can row against the current three-fourth of a kilometre in 15 min and returns same distance in 10 min, then ratio of his speed to that of current is?

    • Options
    • A. 3 : 5
    • B. 5 : 3
    • C. 1 : 5
    • D. 5 : 1
    • Discuss
    • 9. 
      A boat running upstream takes 528 min to cover a certain distance, while it takes 240 min to cover the same distance running downstream. What is the ratio between the speed of the water current, respectively?

    • Options
    • A. 2 : 1
    • B. 3 : 2
    • C. 8 : 3
    • D. Couldn't be determined
    • Discuss
    • 10. 
      A motorboat travelling at the same speed, can cover 25 km upstream and 39 km downstream in 8 h. At the same speed, it can travel 35 km upstream and 52 km downstream in 11 h. The speed of the stream is?

    • Options
    • A. 2 km/h
    • B. 3 km/h
    • C. 4 km/h
    • D. 5 km/h
    • Discuss


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