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 9 of 9.
YOGESH SHINDE said:
9 years ago
Yes. So option A is correct.
Raj said:
9 years ago
D=S/T or D=S * T @ Venkat.
Sathish said:
9 years ago
Please tell me 1 mile = ?
Prabhat said:
9 years ago
Well done @Sowmya.
Pandian said:
10 years ago
Miles per hour.
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