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Quantitative Aptitude > Boats And Streams :
Question 1.

A man can row three-quarters of the a kilometer against the stream in 11   1/2 minutes . the speed ( in km/hr ) of the man in stiil water is :



 

Options:
  1.    2
  2.    3
  3.    4
  4.    5
Answer: Option D

Question 2.

In one hr , a boat goes 11 km along the stream and 5 km againnt the stream. The speed of the boat in stiil water ( in km / hr ) is :

Options:
  1.    3
  2.    5
  3.    8
  4.    9
Answer: Option C

Question 3.

A boat takes 90 minutes less to travel  36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph , Find the speed of the stream .

Options:
  1.    2 mph
  2.    3 mph
  3.    4 mph
  4.    5 mph
Answer: Option A

Question 4.

  1. The speed of a boat in still water is 15 km/hr and  the rate of current is 3 km/hr the distance travelled downstream in  2 min. is :

Options:
  1.    1.2 km
  2.    2.4 km
  3.    3.6 km
  4.    none of these
Answer: Option C

Question 5.

  1. The speed of a boat in steel in still water is 10 km/hr . If it can travel 26 km downs stream and 14 km upstream in the same time , the speed of the stream is :

Options:
  1.    2 km/hr
  2.    3 km/hr
  3.    4 km/hr
  4.    5 km/hr
Answer: Option B

Question 6.

A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

Options:
  1.    2 hours
  2.    3 hours
  3.    4 hours
  4.    5 hours
Answer: Option C

Speed downstream = (13 + 4) km/hr = 17 km/hr.

Time taken to travel 68 km downstream = \(\left(\frac{68}{17}\right)hrs = 4hrs.\)