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  • Question
  • A boatman can row 3 km against the stream in 20 minutes and return in 18 minutes. Find the rate of current ?


  • Options
  • A. 1/3 kmph
  • B. 2/3 kmph
  • C. 1/4 kmph
  • D. 1/2 kmph

  • Correct Answer
  • 1/2 kmph 

    Explanation

    Speed in upstream = Distance / Time = 3 x 60/20 = 9 km/hr.

    Speed in downstream = 3 x 60/18 = 10 km/hr

    Rate of current = (10-9)/2 = 1/2 km/hr.


  • Boats and Streams problems


    Search Results


    • 1. A man rows his boat 60 km downstream and 30 km upstream taking 3 hrs each time. Find the speed of the stream ?

    • Options
    • A. 5 kmph
    • B. 10 kmph
    • C. 15 kmph
    • D. 45 kmph
    • Discuss
    • 2. A man goes down stream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the strean are 10km/hr and 14km/hr respectively, the distance of the destination from the string place is

    • Options
    • A. 16 km
    • B. 18 km
    • C. 21 km
    • D. 25 km
    • Discuss
    • 3. A boy can swim in still water at 4.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is ?

    • Options
    • A. 1.8 kmph
    • B. 2 kmph
    • C. 2.2 kmph
    • D. 1.5 kmph
    • Discuss
    • 4. The current of a stream at 1 kmph. A motor boat goes 35 km upstream and back to the starting point in 12 hours. The speed of the motor boat in still water is ?

    • Options
    • A. 8 kmph
    • B. 6 kmph
    • C. 7.5 kmph
    • D. 5.5 kmph
    • Discuss
    • 5. A motor boat takes 12 hours to go downstream and it takes 24 hours to return the same distance. what is the time taken by boat in still water?

    • Options
    • A. 15 h
    • B. 16 h
    • C. 8 h
    • D. 20 h
    • Discuss
    • 6. A man can row 6 kmph in still water. When the river is running at 1.2 kmph, it takes him 1 hour to row to a place and back. What is the total distance traveled by the man ?

    • Options
    • A. 4.58 kms
    • B. 6.35 kms
    • C. 5.76 kms
    • D. 5.24 kms
    • Discuss
    • 7. A boat 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 boat and speed of the water current respectively?

    • Options
    • A. 7:4
    • B. 11:4
    • C. 4:7
    • D. 8:3
    • Discuss
    • 8. A boat whose speed in still water is 9 kmph, goes 12 km downstream and comes back in 3 hrs. Find the speed of the stream?

    • Options
    • A. 1 kmph
    • B. 3 kmph
    • C. 5 kmph
    • D. 4 kmph
    • Discuss
    • 9. A man can row 8 kmh in still water. If the river is running at 2 kmh, it takes 4 hrs more upstream than to go downstream for the same distance. Then the distance is given by

    • Options
    • A. 54 kms
    • B. 32 kms
    • C. 45 kms
    • D. 60 kms
    • Discuss
    • 10. A motorboat can go 10 miles downstream on a river in 20 min. It takes 30 min for this boat to go back at the same 10 miles. Find the speed of the current ?

    • Options
    • A. 8 m/h
    • B. 5 m/h
    • C. 7 m/h
    • D. 6 m/h
    • Discuss


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