Question

If the boat goes 7 kms upstream in 42 min and speed of the stream is 3 kmph, then the speed of the boat in still water ?
A) 14 kmph
B) 13 kmph
C) 12 kmph
D) 11 kmph

Answer 1

13 is the answer
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Answer 2

$\huge{\boxed{\red {\bf{Answer}}}}$


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If the boat goes 7 kms upstream in 42 min and speed of the stream is 3 kmph, then the speed of the boat in still water ?
A) 14 kmph
B) 13 kmph
C) 12 kmph
D) 11 kmph

$\huge\underline{\green {\textbf{B) 13 kmph}}}$

Given that, upstream distance = 7 kms

Upstream speed = 7/42 x 60 = 10 kms

Speed of the stream = 3 kmph

Let speed in still water = M kmph, then

Upstream speed = M - 3 = 10

=> M = 13 kmph.


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