Quantitative Aptitude-More exercise questions updated on Aug 2019
Boats and Streams problems are frequently asked problems in competitive exams. Many different types of questions can be framed out of boat and stream problems. In order to solve elementary questions on Boats and Streams in the competitive exmas, candidates should use the fundamental concepts of time speed and distance only.

Boats and Streams-Exercise Questions

|   64155

1.   A person can row 750 metres  against the stream in 11 ¼ minutes and returns in 7 ½ minutes. The
      speed of the person in in still water is :

      a) 2 km/hr b)3 km/hr         c)4km/hr          d) 5 km/hr

 

2.   If a man rows at the rate of 6 kmph in still water and his rate aginst the current is 4.5 kmph, then
      the man’s rate along the current is

      a) 6 kmph  b)7.5 kmph     c) 6.5kmph      d) 8 kmph       

 

3.   A boat moves upstream at the rate of 1 km in 20 minutes and down stream 1 km in 12 minutes. The
     speed  of the current is :

     a) 1 kmph b)2 kmph         c)3 kmph         d)2.5 kmph

 

4.   A man can row  a boat at 10 kmph in still water and  the speed of the stream is 8 kmph. What is the
     time taken to row a distance of 90 km down the stream ?

     a) 8hrs                   b)5 hrs                        c) 15 hrs          d) 20 hrs

 

5.   If athul  rows 16 km upstream and 24 km down steam  taking 4 hours each, then the speed of the
      stream

          a) 1kmph  2)kmph            3)1.5 kmph      12 kmph

 

Answer & Explanations

 

1. The speed in upstream = .75 * (4/45 )*60 = 4 kmph

    The speed in downstream = .75 *(2/15) *60 = 6 kmph

    Speed in still water = ½(4+6) = 5 kmph

2. Let the rate along the current be x kmph

   Then, ½ (x+ 4.5) = 6  :. x = 7.5

3. Rate upstream = (1/20 *60)  = 3 kmph

    Rate dowm stream = 1/12 * 60 = 5 kmph

    Rate of the current = ½ (5-3) = 1 kmph

4. Speed in down stream = 10 +8 = 18

   Time taken to cover 90 km  down stream = 90/18 = 5 hrs. 

5. Speed upstream = 16/4 = 4 kmph

   Speed down stream = 24/4 = 6 kmph

   Speed of stream = ½ (6-4) = 1 kmph

Boats and Streams problems are frequently asked problems in competitive exams. Many different types of questions can be framed out of boat and stream problems. In order to solve elementary questions on Boats and Streams in the competitive exmas, candidates should use the fundamental concepts of time speed and distance only. However, some types of difficult problems are tricky and take lots of time to solve by applying textbook approach. These useful tricks, formula and shortcuts are given by freshersworld. Freshersworld.com provides with Boats and Streams - Aptitude Questions and Answers with Explanation, test, solved examples that would help candidates in clearing all the placement papers and competitive tests. It also provides online test on Boats and Streams- quantitative Aptitude. What is upstream and downstream in maths? When the direction of the moving boat and the direction of the stream is opposite, then the boat is in upstream. On the other hand, when direction of the moving boat and the direction of the stream is same, then the boat is in downstream. How do you calculate the average speed of a boat? Upstream Speed * Downstream Speed / Speed of boat in still water
feedback