Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 8)
8.
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, the speed of the stream is:
Answer: Option
Explanation:
Let the speed of the stream x mph. Then,
Speed downstream = (10 + x) mph,
Speed upstream = (10 - x) mph.
 |
36 | - | 36 | = | 90 |
| (10 - x) | (10 + x) | 60 |
72x x 60 = 90 (100 - x2)
x2 + 48x - 100 = 0
(x+ 50)(x - 2) = 0
x = 2 mph.
Discussion:
85 comments Page 7 of 9.
Soumajit Bose said:
8 years ago
If the boat takes 90 minutes more, then what shall we do?
Puneeth kumar k said:
1 decade ago
Because in question they have mentioned that 90min less.
Vijay said:
8 years ago
36(10 + x) - 36(10 - x) = 90\60.
How to solve this?
How to solve this?
(1)
Arun said:
10 years ago
How this equation came 36/(10-x)-36/(10+x) = 90/60?
Kasa said:
9 years ago
Please give me any shortcuts to find the solution.
Sarath.j said:
7 years ago
Please tell me the shortcut way to get the answer.
Mariyada Ramesh said:
9 years ago
I too have the same doubt @Ram.
Please clear it.
Please clear it.
Aisha gupta said:
10 years ago
Mph means what? "Miles per hr or meter per hr".
Joan said:
1 decade ago
Please explain how you have got (x+50) (x-2).
Akshay said:
10 years ago
Miles should have been converted into meter.
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