Boats and Streams Problems Practice Question and Answer

Q:

Speed of a boat in still water is 12 kmph and that of the current is 3 kmph. A man row a boat upstream up to 135 km and return downstream to the starting point. Find the total time taken for the entire journey in hours.

1036 0

  • 1
    36
    Correct
    Wrong
  • 2
    48
    Correct
    Wrong
  • 3
    30
    Correct
    Wrong
  • 4
    24
    Correct
    Wrong
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Answer : 4. "24"

Q:

A man rows to a place 35 km in distance and back in 10 hours 30 minutes. He found that he can row 5 km with the stream in the same time as he can row 4 km against the stream. Find the rate of flow of the stream? 

4300 0

  • 1
    1.33 km/hr
    Correct
    Wrong
  • 2
    1.5 km/hr
    Correct
    Wrong
  • 3
    1 km/hr
    Correct
    Wrong
  • 4
    0.75 km/hr
    Correct
    Wrong
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Answer : 4. "0.75 km/hr"

Q: 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? 1520 0

  • 1
    7:4
    Correct
    Wrong
  • 2
    11:4
    Correct
    Wrong
  • 3
    4:7
    Correct
    Wrong
  • 4
    8:3
    Correct
    Wrong
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Answer : 4. "8:3"
Explanation :

Answer: D) 8:3 Explanation: Let the speed of the boat upstream be p kmph and that of downstream be q kmph   Time for upstream = 8 hrs 48 min = 845hrs   Time for downstream = 4 hrs   Distance in both the cases is same.   => p x  845= q x 4   => 44p/5 = 4q   => q = 11p/5    Now, the required ratio of Speed of boat : Speed of water current   = q+p2:q-p2   => (11p/5 + p)/2  : (11p/5 - p)/2   => 8 : 3

Q:

If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is : 

1571 0

  • 1
    4 hr
    Correct
    Wrong
  • 2
    7 hr
    Correct
    Wrong
  • 3
    2 hr
    Correct
    Wrong
  • 4
    3 hr
    Correct
    Wrong
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Answer : 1. "4 hr"

Q:

If a boat goes upstream at a speed of 24 km/hr and comes back the same distance at 40 km/hr. What is the average speed (in km/hr) for the total journey?

1230 0

  • 1
    32
    Correct
    Wrong
  • 2
    30
    Correct
    Wrong
  • 3
    31
    Correct
    Wrong
  • 4
    33
    Correct
    Wrong
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Answer : 2. "30"

Q: A man went downstream for 28 km in a motor boat and immediately returned. It took the man twice as long to make the return trip. If the speed of the river flow were twice as high, the trip downstream and back would take 672 minutes. Find the speed of the boat in still water and the speed of the river flow. 52740 0

  • 1
    12 km/hr, 3 km/hr
    Correct
    Wrong
  • 2
    9 km/hr, 3 km/hr
    Correct
    Wrong
  • 3
    8 km/hr, 2 km/hr
    Correct
    Wrong
  • 4
    9 km/hr, 6 km/hr
    Correct
    Wrong
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Answer : 2. "9 km/hr, 3 km/hr"
Explanation :

Answer: B) 9 km/hr, 3 km/hr Explanation: Let the speed of the boat = p kmph Let the speed of the river flow = q kmph From the given data, 2 x 28p + q = 28p - q   => 56p - 56q -28p - 28q = 0 => 28p = 84q => p = 3q. Now, given that if 283q + 2q + 283q - 2q = 67260=> 285q + 28q = 67260=> q = 3 kmph=> x  =3q = 9 kmph   Hence, the speed of the boat = p kmph = 9 kmph and the speed of the river flow = q kmph = 3 kmph.

Q:

Ratio between speed of boat in still water to speed of stream is 7 : 2. If 126 km is travelled downstream in 3.5 hours then find the difference between speed of boat in still water to speed of stream(in kmph)?

1465 0

  • 1
    15
    Correct
    Wrong
  • 2
    22
    Correct
    Wrong
  • 3
    24
    Correct
    Wrong
  • 4
    20
    Correct
    Wrong
  • 5
    18
    Correct
    Wrong
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Answer : 4. "20"

Q:

Speed of boat in upstream is 11km/hr and downstream is 23 km/hr find the speed of boat in still water?

1154 0

  • 1
    15 km/hr
    Correct
    Wrong
  • 2
    17 km/hr
    Correct
    Wrong
  • 3
    9 km/hr
    Correct
    Wrong
  • 4
    8 km/hr
    Correct
    Wrong
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Answer : 2. "17 km/hr"

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