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  • Question
  • If the boat goes 7 kms upstream in 42 min and speed of the stream is 3 kmph, then the speed of the boat in still water ?


  • Options
  • A. 14 kmph
  • B. 13 kmph
  • C. 12 kmph
  • D. 11 kmph

  • Correct Answer
  • 13 kmph 

    Explanation

    Given that, upstream distance = 7 kms

    Upstream speed = 7/42 x 60 = 10 kms

    Speed of the stream = 3 kmph

    Let speed in still water = M kmph, then

    Upstream speed = M - 3 = 10

    => M = 13 kmph.

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    Boats and Streams problems


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    • 1. A boat while travelling upstream covers a distance of 29 km at the speed of 6 km/h, whereas while travelling downstream it covers the same distance at a speed of 12 km/h. What is the speed of the boat in still water?

    • Options
    • A. 6 kmph
    • B. 8 kmph
    • C. 9 kmph
    • D. 11 kmph
    • Discuss
    • 2. A motorboat goes 8 km an hour in still water, but takes thrice as much time in going the same distance against the current than going with the current. Then find the speed of the current?

    • Options
    • A. 4 kmph
    • B. 6 kmph
    • C. 3 kmph
    • D. 2 kmph
    • Discuss
    • 3. A man can row upstream at 16 km/hr and downstream at 24 km/hr. Find the speed of the current.

    • Options
    • A. 4 kmph
    • B. 6 kmph
    • C. 5 kmph
    • D. 3 kmph
    • Discuss
    • 4. A motorboat takes half time to cover a certain distance downstream than upstream. What is the ratio between rate of current and rate of boat in still water?

    • Options
    • A. 1 : 3
    • B. 3 : 2
    • C. 2 : 3
    • D. 3 : 1
    • Discuss
    • 5. A boat can move 5 km/hr in still water. If the river is running at 1 km/hr, it takes it 75 min to move to a place and back. How far is the place?

    • Options
    • A. 3 kms
    • B. 5 kms
    • C. 6 kms
    • D. 4 kms
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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