Aptitude - Boats and Streams - Discussion
Read more: "I never see what has been done; I only see what remains to be done."
- Marie Curie
13.
Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:
[A]. 16 hours [B]. 18 hours [C]. 20 hours [D]. 24 hours
Answer: B
Explanation:
Speed upstream = 7.5 kmph.
Speed downstream = 10.5 kmph.
105
+
105
7.5
10.5
Ramya said:
(Mon, May 2, 2011 01:20:05 AM)
How do you arrive at upstream and down stream speed.
Bhavana said:
(Sat, Jul 2, 2011 01:22:22 AM)
How do you calculate upstream and downstream speed?
Bhavana said:
(Sat, Jul 2, 2011 01:38:34 AM)
Speed upstream is 9+1.5 and downstream is 9-1.5.
Kau said:
(Sun, Sep 18, 2011 12:19:55 AM)
You are wrong Bhavana, you have written opposite.
Raju said:
(Sat, Nov 5, 2011 08:08:08 PM)
Time taken for up stream = 105/(9-1.5)=14h
Rakesh Kiit said:
(Mon, Sep 3, 2012 12:46:15 AM)
Average speed During the Journey = (2*(9+1.5)*(9-1.5))/(9+1.5)+
Total time taken =
hours = 24 hours.