A boat moving upstream takes 6 hours 36 minutes to cover a certain distance while it takes 3 hours to cover the same distance downstream. What is the ratio of the speed of boat in still water to the speed of stream ?
Answer & explanation
Correct answer: option 4
The correct answer is option (4) : 8 : 3
Given, Time taken in upstream = 6.6 hours
Time taken in downstream = 3 hours
$\frac{x+y}{x-y}=\frac{6.6}{3}$
$3x+3y=6.6x-6.6y$
$9.6y= 3.6x$
$\frac{x}{y}=\frac{9.6}{3.6}=\frac{8}{3}$ i.e $8 : 3$