Boats and Streams

Find the speed (in km/hr) of the boat in still water. If a boat goes $12$$km$ downstream and comes back to the starting point in$3$ Hours. If the speed of the current is$3$$km/hr$.

A man rows $13 \mathrm{km}$ upstream in $5 \mathrm{h}$ and also $28 \mathrm{km}$ downstream in $5 \mathrm{h}$. The velocity of the stream is ______

What is the speed of stream ?
(i) The boat covers $20$ $km$ in $5$ hours moving up stream.
(ii) The boat covers $20$ $km$ in $4$ hours moving down stream.
(iii) The ratio between the speed of boat and stream is $2 : 1$ respectively.
Which of the following statements are necessary to answer the question:

A boat can cover upstream $24 \mathrm{km}$ in $6 \mathrm{hours}$ and returns downstream $20 \mathrm{km}$ in $4 \mathrm{hours}$. Then find the speed of boat in still water$?$

A man can row $\frac{3}{4}$ of a km against the stream in $11\frac{1}{4} \min$ and returns in$7\frac{1}{2} \min$. Find his speed in still water.

The speed of a boat in still water $11 \mathrm{km}/\mathrm{hr}$. It can go $12 \mathrm{km}$ upstream and return downstream to the starting point in $2 \mathrm{hr} 45 \min$. What is the speed of stream?

The speed of the current is $2 \mathrm{km}/\mathrm{h}$. A boat goes $20 \mathrm{km}$ upstream and back again to the starting point in $110 \min$. What is the speed of the boat in still water?

In a stream running at $2 \mathrm{km}/\mathrm{hr}$ a boat goes $6 \mathrm{km}$ up-stream and back again to be the starting point after $33 \min$. Find the speed of the boat in still water?

A boat goes down stream at$x \raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{hr}$}\right.$ and upstream at $y \raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{hr}$}\right.$. The speed of the boat in still water is _____.

A man rows upstream a distance of $9 \mathrm{km}$ or downstream a distance of $18 \mathrm{km}$ taking $3 \mathrm{h}$ each time. Find the speed of the boat in still water.

A boat covers a distance of $24$km in down stream in $4$hours while it covers the same distance in upstream in $6$hours. What is the speed of boat in still water?

Speed of the boat on calm water is $15 \mathrm{kmph}$. After floating $45 \mathrm{km}$ against the direction of flow it returns to its initial position in $\frac{27}{4} \mathrm{h}$. Find the speed of flow.

What is the speed of the stream in $km/hr$. A motorboat, whose speed in $15$ $km/hr$ in still water goes $30$ $km$ Downstream and comes back in a total of $4 hours 30 minutes$ ?

A boat has to travel upstream $20 \mathrm{km}$ distance from point X of a river to point Y. The total time taken by the boat in travelling from point X to Y and Y to X is $4$ minutes and $40$ seconds. What is the speed of the boat?

Find the speed of the stream. A boat takes $90$ Minutes less to travels $36$ Miles downstream than to travel the same distance upstream. If the speed of the boat in still water is $10$ $m/h$.

A boat covers $12 \mathrm{km}$ upstream and$18 \mathrm{km}$downstream in $3 \mathrm{hrs}$, while it covers$36 \mathrm{km}$upstream and $24 \mathrm{km}$downstream in $6\frac{1}{2} \mathrm{hours}$. What is the speed of the current?

A boat takes $150 \min$ less to travel $40 km$ downstream than to travel the same distance upstream. The speed of the stream is $4 km/hr$. What is the downstream speed?

Subhash started from point P in a boat to reach point Q. After$8.7 \mathrm{hours}$, he covered only $15\%$ of the distance and reach at point R. Now, Subhash started from point R and reached at mid-point of P and Q and came back to R in $35.35 \mathrm{hours}$. Time taken by Subhash to cover the distance between Q and P when he started from point Q is $13 \mathrm{hours}$ more than time taken by Rajesh to cover a distance of $720 \mathrm{km}$ in upstream and the speed of Rajesh in downstream is $20\%$ more than his speed in still water. 

In what time Subhash can cover the distance between Q and P if he started from point Q? 

A person can row a distance of $2 \mathrm{km}$ upstream in $15 \min$ and downstream in $6 \min$. What is the speed of the stream ?

Ram rows a boat against a stream flowing at $2 \mathrm{km}/\mathrm{h}$ for a distance of $12 \mathrm{km}$ and then turns around and rows back with the current. If the whole trip lasts $8$hours, find Ram's rowing speed in still water.