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Boats and Streams

Quantitative Aptitude · Maths Bookwise · Work & Motion

Useful for: SSC CGL

BOOK-GUIDED ORIGINAL SSC MATHS PRACTICE — Boats and Streams

FOUNDATION

Still-water speed = (downstream + upstream speeds)/2.

METHOD

Identify the quantities given, choose the exact relationship, calculate in the same unit, then check the answer against the question.

WORKED EXAMPLE 1

Boat speeds downstream and upstream are 37 and 7 km/h. Find still-water speed.

Still-water speed = (37+7)/2 = 22 km/h.

WORKED EXAMPLE 2

Boat speeds downstream and upstream are 59 and 3 km/h. Find still-water speed.

Still-water speed = (59+3)/2 = 31 km/h.

IMPORTANT EXCEPTION / COMMON TRAP

Downstream speed exceeds upstream for positive current.

QUICK REVISION

Still-water speed = (downstream + upstream speeds)/2.

SEE MORE: https://study.kundali-iq.com/ssc-maths/boats/

For complete timed maths practice, use SSC CGL Test Series → New Maths 100 Mixed Sets or Chapter-wise sets. These are independent original questions, not copied previous-year questions.

Practice MCQs

  1. Boat speeds downstream and upstream are 37 and 7 km/h. Find still-water speed.

    1. 22
    2. 24
    3. 23
    4. 21

    Read chapter notes · Similar questions

    Show answer

    Answer: (a) 22. Still-water speed = (37+7)/2 = 22 km/h.

  2. Boat speeds downstream and upstream are 59 and 3 km/h. Find still-water speed.

    1. 33
    2. 31
    3. 29
    4. 35

    Read chapter notes · Similar questions

    Show answer

    Answer: (b) 31. Still-water speed = (59+3)/2 = 31 km/h.

  3. Boat speeds downstream and upstream are 40 and 12 km/h. Find still-water speed.

    1. 28
    2. 27
    3. 25
    4. 26

    Read chapter notes · Similar questions

    Show answer

    Answer: (d) 26. Still-water speed = (40+12)/2 = 26 km/h.

  4. Boat speeds downstream and upstream are 42 and 10 km/h. Find still-water speed.

    1. 26
    2. 28
    3. 25
    4. 27

    Read chapter notes · Similar questions

    Show answer

    Answer: (a) 26. Still-water speed = (42+10)/2 = 26 km/h.

  5. A boat travels downstream at 26 km/h and upstream at 14 km/h. What is its speed in still water

    1. 12 km/h
    2. 18 km/h
    3. 20 km/h
    4. 24 km/h

    Read chapter notes · Similar questions

    Show answer

    Answer: (c) 20 km/h. Still-water speed = (26 + 14) / 2 = 20 km/h.

More topics in this chapter

Notes and questions are written by Kundali IQ for practice. They are not official papers; always check the latest official notification for the syllabus and pattern.