Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 13)
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:
Answer: Option
Explanation:
Speed upstream = 7.5 kmph.
Speed downstream = 10.5 kmph.
 Total time taken = |
 |
105 | + | 105 |  hours = 24 hours. |
| 7.5 | 10.5 |
Discussion:
24 comments Page 2 of 3.
Saran said:
1 decade ago
Speed of boat in still water is 9km how could you consider it as upstream speed similarly to downstream also they couldn't mention anything like that. Please explain.
Bhavana said:
1 decade ago
Speed upstream is 9+1.5 and downstream is 9-1.5.
I think generally in stream sums we should calculate first the upstream and the downstream values.
I think generally in stream sums we should calculate first the upstream and the downstream values.
Gego Georoge said:
1 decade ago
I have a doubt, 9 km in question is speed of Boat, and a man rows 105 km but his speed is not given, and we have to find time taken by man.
Raju said:
1 decade ago
Time taken for up stream = 105/(9-1.5)=14h
Time taken for down stream =
105/(9+1.5)=10h Total time taken= 14+10=24h
Time taken for down stream =
105/(9+1.5)=10h Total time taken= 14+10=24h
(1)
Abhi poojary said:
1 decade ago
Just calculate downstream. 10 hours. Upstream has to be more than 10. So only 24 possible.
Priti kumari said:
7 years ago
How did we get that once it was upstream and next time it was downstream?
Azar said:
1 decade ago
On what basis Upstream and down stream speed is calculated?
Ramya said:
1 decade ago
How do you arrive at upstream and down stream speed.
Bhavana said:
1 decade ago
How do you calculate upstream and downstream speed?
Ranvijay said:
5 years ago
How it is taken 7.5 for upstream? please explain.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers