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  • Question
  • A man rows to a place 48 km distance and back in 14 hours . He finds that he can row 4 km with the stream in the same time as 3 km against the stream. Find the rate of the stream?


  • Options
  • A. 1 km/hr
  • B. 2 km/hr
  • C. 1.5 km/hr
  • D. 2.5 km/hr

  • Correct Answer
  • 1 km/hr 

    Explanation

    Suppose that the man takes H hours to cover 4 km downstream and H house to cover 3 km upstream.
    Then, 48H/4 + 48H/3 = 14
    ? H = 1/2
    ? Rate upstream = 3/(1/2)= 6 km/hr
    and rate downstream = 4/(1/2) = 8 km/hr
    ? Rate of the stream = (8 - 6)/2 = 1 km/hr .


  • Boats and Streams problems


    Search Results


    • 1. 
      Ramesh can row a certain distance downstream is 6 hours and return the same distance in 9 hours. If the speed of Ram, Ramesh in still water is 12 km/hr, find the speed of the stream.

    • Options
    • A. 2.4 km/hr
    • B. 2 km/hr
    • C. 3 km/hr
    • D. Data inadequate
    • Discuss
    • 2. 
      The speed of a boat in still water is 4 km/hr and the speed of current is 2 km/hr. If the time taken to reach a certain distance upstream is 9 hours, find the time it will take to go same distance downstream?

    • Options
    • A. 2 hrs
    • B. 2.5 hrs
    • C. 3.5 hrs
    • D. 3 hrs
    • Discuss
    • 3. 
      A motorboat travelling at the same speed, can cover 25 km upstream and 39 km downstream in 8 h. At the same speed, it can travel 35 km upstream and 52 km downstream in 11 h. The speed of the stream is?

    • Options
    • A. 2 km/h
    • B. 3 km/h
    • C. 4 km/h
    • D. 5 km/h
    • Discuss
    • 4. 
      A boat running upstream takes 528 min to cover a certain distance, while it takes 240 min to cover the same distance running downstream. What is the ratio between the speed of the water current, respectively?

    • Options
    • A. 2 : 1
    • B. 3 : 2
    • C. 8 : 3
    • D. Couldn't be determined
    • Discuss
    • 5. 
      A man can row against the current three-fourth of a kilometre in 15 min and returns same distance in 10 min, then ratio of his speed to that of current is?

    • Options
    • A. 3 : 5
    • B. 5 : 3
    • C. 1 : 5
    • D. 5 : 1
    • Discuss
    • 6. 
      Raman covers 1 km in 8 min while suman covers the same distance in 10 min. By what distance does Raman beat Suman?

    • Options
    • A. 150 m
    • B. 65 m
    • C. 190 m
    • D. 200 m
    • Discuss
    • 7. 
      In a race of 150 m, A gives B a start of 20 m. What distance will be covered by B?

    • Options
    • A. 100 m
    • B. 130 m
    • C. 170 m
    • D. 160 m
    • Discuss
    • 8. 
      In a race, P gives Q a start of 25 m making length of race for Q a distance of 175 m. Find the total length of race.?

    • Options
    • A. 250 m
    • B. 200 m
    • C. 225 m
    • D. 235 m
    • Discuss
    • 9. 
      In a 800 m race, A gives some start to B and this makes the length of race for B 725 m. What start does B get from A?

    • Options
    • A. 22 m
    • B. 35 m
    • C. 45 m
    • D. 75 m
    • Discuss
    • 10. 
      In a game of 100 points, A scores 100 points while B scores only 65 points. In this game, how much points can A give to B?

    • Options
    • A. 45
    • B. 35
    • C. 25
    • D. 55
    • Discuss


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