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Home Aptitude Boats and Streams See What Others Are Saying!
  • Question
  • A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:


  • Options
  • A. 2 mph
  • B. 2.5 mph
  • C. 3 mph
  • D. 4 mph

  • Correct Answer
  • 2 mph 

    Explanation
    Let the speed of the stream x mph. Then,

    Speed downstream = (10 + x) mph,

    Speed upstream = (10 - x) mph.

    36 - 36 = 90
    (10 - x) (10 + x) 60

    ⟹ 72x x 60 = 90 (100 - x2)

    x2 + 48x - 100 = 0

    ⟹ (x+ 50)(x - 2) = 0

    x = 2 mph.


  • More questions

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      The median for the data 2, 4, 6, 8, 10, 12, 14 is

    • Options
    • A. 6
    • B. 8
    • C. 9.5
    • D. 10
    • Discuss
    • 2. 
      The value of 47 / 10000 is?

    • Options
    • A. .0047
    • B. .0470
    • C. .00047
    • D. .000047
    • Discuss
    • 3. If 4x = 18y, then the value of ( x/y - 1) is

    • Options
    • A. 1 3
    • B. 7 2
    • C. 2 3
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    • 4. 
      If the price of 23 toys is Rs. 276, then what will the price (Rs.) of 12 toys?

    • Options
    • A. 144
    • B. 158
    • C. 159
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    • 5. 
      .02 =(......?.....)%

    • Options
    • A. 20
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    • 6. 
      If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?

    • Options
    • A. 45
    • B. 55
    • C. 60
    • D. 72
    • Discuss
    • 7. 
      2?63 / 11 =233

    • Options
    • A. 4
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    • C. 6
    • D. 5
    • Discuss
    • 8. 
      When 121012 is divided by 12, the remainder is

    • Options
    • A. 0
    • B. 2
    • C. 3
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    • Discuss
    • 9. 
      Aarti can do a piece of work in 6 days. In how many days will she complete three time of work of same type?

    • Options
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    • Discuss
    • 10. 
      750.0003 ÷ 19.999 =?

    • Options
    • A. 49
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