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  • Question
  • Find the speed of stream if a boat covers 36 km in downstream in 6 hours which is 3 hours less in covering the same distance in upstream?


  • Options
  • A. 1.5 kmph
  • B. 1 kmph
  • C. 0.75 kmph
  • D. 0.5 kmph

  • Correct Answer
  • 1 kmph 

    Explanation

    Speed of the boat upstream = 36/9 = 4 kmph

    Speed of the boat in downstream = 36/6 = 6 kmph

    Speed of stream = 6-4/2 = 1 kmph


  • Boats and Streams problems


    Search Results


    • 1. Rajesh rows in still water with a speed of 4.5 kmph to go to a certain place and comes back. Find his average speed for the whole journey, if the river is flowing with a speed of 1.5 kmph?

    • Options
    • A. 2 kmph
    • B. 4 kmph
    • C. 6 kmph
    • D. 8 kmph
    • Discuss
    • 2. A boatman can row 96 km downstream in 8 hr. If the speed of the current is 4 km/hr, then find in what time he will be able to cover 8 km upstream ?

    • Options
    • A. 1.5 hrs
    • B. 1 hrs
    • C. 2.5 hrs
    • D. 2 hrs
    • Discuss
    • 3. A boat travels 72 km downstream in 8 hours and 84 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current ?

    • Options
    • A. 9 and 3 kmph
    • B. 6 and 7 kmph
    • C. 8 and 1 kmph
    • D. 7 and 2 kmph
    • Discuss
    • 4. If sum of upstream and downstream speed of a boat is 82 kmph, and the boat travels 105 km. upstream in 3 hr, Find the time taken by boat to cover 126 km downstream.

    • Options
    • A. 2.8 hrs
    • B. 2.7 hrs
    • C. 2.6 hrs
    • D. 2.5 hrs
    • Discuss
    • 5. In one hour, a boat goes 12 km/hr along the stream and 6 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

    • Options
    • A. 9
    • B. 8
    • C. 7
    • D. 7.5
    • Discuss
    • 6. A man can row against the current three fourth of a kilometer in 15 min and returns same distance in 10 min, then ratio of his speed to that of current?

    • Options
    • A. 5:1
    • B. 3:1
    • C. 4:1
    • D. 2:1
    • Discuss
    • 7. A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current ?

    • Options
    • A. 1 kmph
    • B. 3.2 kmph
    • C. 1.5 kmph
    • D. 2 kmph
    • Discuss
    • 8. A person can row 8 1/2 km an hour in still water and he finds that it takes him twice as long to row up as to row down the river. The speed of the stream ?

    • Options
    • A. 1.78 kmph
    • B. 2.35 kmph
    • C. 2.83 kmph
    • D. 3.15 kmph
    • Discuss
    • 9. Amith can row a boat d km upstream and the same distance downstream in 5 hours 15 minutes. Also, he can row the boat 2d km upstream in 7 hours. How long will it take to row the same distance 2d km downstream for Amith ?

    • Options
    • A. 4 hrs 10 min
    • B. 3 hrs 15 min
    • C. 3 hrs 30 min
    • D. 4 hrs 1 min
    • Discuss
    • 10. A motorboat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the motorboat and speed of the water current respectively?

    • Options
    • A. 3:7
    • B. 7:9
    • C. 5:4
    • D. 8:3
    • Discuss


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