Q1: 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
None of these
B 12 kmph
C 13 kmph
D
15 kmph
E
14 kmph
ANS:D -
15 kmph
Let the speed of the boat in still water be x kmph. Then,
Speed downstream = (x + 3) kmph,
Speed upstream = (x - 3) kmph.
hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?
(
2x + 6 = 3x - 9