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  • Question
  • Choose the most appropriate answer:A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9 Km/h and the speed of the current is 3 Km/h, the distance between A and B is


  • Options
  • A. 9 km
  • B. 10 km
  • C. 11 km
  • D. 12 km

  • Correct Answer
  • 12 km 

    Explanation

    Speed of boat in still water = 9 km/hr

    Speed of current = 3km/hr

    Downstream speed = 9+3 = 12 km/hr

    Upstream speed = 9-3 =6 km/hr

    Let the distance between A to B be x km.

    x/6 + x/12 = 3x + 2x = 36
    3x = 36
    x = 12 km

  • Tags: Bank Exams

    Boats and Streams problems


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    • 1. A boat takes 2 hours to travel from point A to B in still water. To find out its speed upstream, which of the following information is/are required? A. Distance between point A and B. B. Time taken to travel downstream from B to A. C. Speed of the stream of water.

    • Options
    • A. Only A and B
    • B. Only B and C
    • C. All are required
    • D. Any one pair of A and B, B and C or C and A is sufficient
    • Discuss
    • 2. Equal distance is covered by a boat in upstream and in downstream in total 5 hours. Sum of speed of a boat in upstream and downstream is 40 km/hr. Speed of boat in still water is 600% more than the speed of stream. Find theapproximate distance covered by boat in downstream (in km).

    • Options
    • A. 45
    • B. 50
    • C. 55
    • D. 60
    • Discuss
    • 3. Mahesh rows to the place 80 km away and back in 20 hours. He finds that he can row 8 km downstream in the same time as 4 km upstream. The speed of the boat in stillwater is

    • Options
    • A. 9 kmph
    • B. 7 kmph
    • C. 2 kmph
    • D. 5 kmph
    • Discuss
    • 4. A boat travels 24 km upstream in 6 h and 20 km downstream in 4 h. then, the speed of a boat in still water and the speed of current are respectively

    • Options
    • A. 4.5 km/h and 3 km/h
    • B. 4.5 km/h and 0.5 km/h
    • C. 4 km/h and 2 km/h 5 km/h and 2 km/h
    • D. 5 km/h and 2 km/h
    • Discuss
    • 5. A boat goes 4 km upstream and 4 km downstream in 1 hour. The same boat goes 5 km downstream and 3 km upstream in 55 minutes. What is the speed (in km/hr) of oat in still water?

    • Options
    • A. 6.5
    • B. 7.75
    • C. 9
    • D. 10.5
    • Discuss
    • 6. If a boat goes a certain distance at 30 km/hr and comes back the same distance at 60 km/hr. What is the average speed (in km/hr) for the total journey?

    • Options
    • A. 45
    • B. 50
    • C. 40
    • D. 35
    • Discuss
    • 7. A steamer moves with a speed of 4.5 km/h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h. The average speed of steamer for the total journey is

    • Options
    • A. 12 km/h
    • B. 10 km/h
    • C. 6 km/h
    • D. 4 km/h
    • Discuss
    • 8. The ratio of the speed of a boat downstream and speed of the stream is 9:1. If the speed of the current is 3 km per hr, find the distance travelled by the boat upstream in 5 hours.

    • Options
    • A. 100 km
    • B. 98 km
    • C. 109 km
    • D. 105 km
    • Discuss
    • 9. A boat goes a certain distance at 40 km/hr and comes back the same distance at 24 km/hr. What is the average speed (in km/hr) for the total journey?

    • Options
    • A. 32
    • B. 28
    • C. 34
    • D. 30
    • Discuss
    • 10. A boat moves down stream at the rate of 8km/hr. and upstream at 4Km/hr. The speed of the boat in still waters is:

    • Options
    • A. 4.5 km/hr.
    • B. 5 km/hr.
    • C. 6 km/hr.
    • D. 6.4 km/hr.
    • Discuss


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