Problems on Boats and Streams

Problems on boats and streams:

11) The velocity of a boat in still water is 9 km/hr, and the speed of the stream is 2.5 km/hr. How much time will the boat take to go 9.1 km against the stream?

  1. 1 hr. 20min
  2. 2hr. 40min
  3. 1hr. 24min
  4. 2hr. 48min

12) A man covers a distance of 36 km in 6 hours downstream and a distance of 40 km upstream in 8 hours. What is his speed in still water?

  1. 5.5km/hr
  2. 8km/hr
  3. 7km/hr
  4. None of these

13) A boat travels upstream from Q to P and downstream from P to Q in 3 hours. If the distance between P to Q is 4km and the speed of the stream is 1kmph, then what is the velocity of the boat in still water?

  1. 3kmph
  2. 4kmph
  3. 5kmph
  4. 7.2kmph

14) The speed of the stream is 5km/hr. A boat goes 10 km upstream and returns back to the starting point in 50 minutes. Find the velocity of the boat in still water.

  1. 20km/hr
  2. 25km/hr
  3. 30km/hr
  4. 50km/hr

15) A boat travels from A to B along the stream and from B to A against the stream in 3 hours. If the velocity of the boat in still water is 4 km/hr, what is the distance between A and B?

  1. 8 km
  2. 10 km
  3. 12 km
  4. Data insufficient

16) A man can row, 5km/hr in still water and the velocity of the stream is 1.5 km/hr. He takes an hour when he travels upstream to a place and returns back to the starting point. How far is the place from the starting point?

  1. 2.5 km
  2. 2.275km
  3. 3 km
  4. 4.5km

17) A boatman can row a certain distance down the stream in 2 hours and can row the same distance up the stream in 3 hours. If the velocity of the stream is 4km/hr, what is the speed of the boat in still water?

  1. 8km/hr
  2. 12km/hr
  3. 40km/hr
  4. 20km/hr

18) A man can row 9[1/3] km/hr in still water. He finds that it takes thrice as much time to row upstream as to row downstream (same distance). Find the speed of the current.

  1. 3[1/3] km/hr
  2. 1[1/4] km/hr
  3. 4[2/3] km/hr
  4. 3[1/9] km/hr

19) A boat covers 6 km upstream and returns back to the starting point in 2 hours. If the flow of the stream is 4 km/hr, what is the speed of the boat in still water?

  1. 5km/hr
  2. 6km/hr
  3. 7.3 km/hr
  4. 8km/hr

20) A boat covers 12 km upstream and 18km downstream in 3 hours while it covers 36km upstream and 24 km downstream in 6[1/2] hours, what is the velocity of the stream?

  1. 1.5km/hr
  2. 2km/hr
  3. 3km/hr
  4. 2.5km/hr

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