"Do not wait for leaders; do it alone, person to person."
- Mother Teresa
10.
A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?
[A].
12 kmph
[B].
13 kmph
[C].
14 kmph
[D].
15 kmph
[E].
None of these
Answer: Option E
Explanation:
Let the speed of the boat in still water be x kmph. Then,
hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?
(x + 3) x 1 = (x - 3) x
2x + 6 = 3x - 9