A man takes 15 minutes to row 16 km downstream, which is 25% less than the time he takes to row the same distance upstream. How many kilometres can the man row in an hour in still water? (Rounded off to nearest whole number)

It takes 5 days for a steamboat to travel from A to B along a river. It takes 7 days to return from B to A. How many days will it take for a raft to drift from A to B (assuming all speeds are constant)?

A question is given, followed by three statements labelled I, II and III. Identify which of the statements is/are sufficient to answer the question.

Question:

How much time (in hours) will a boat take to go 25 km downstream?

Statements:

I. The time taken by the boat to go a certain distance downstream is of the time taken by it to go the same distance in still water. $$\frac{7}{10}$$​ 

II. The boat takes 6 hours to go 49 km downstream and 14 km upstream.

III. The ratio of the speed of the boat in still water and the speed of the current is 7 : 3.

Rivers A and B with constant water speeds a and b merge at point P to form river C with a constant water speed c.

A boat having speed s in still water would reach point R from Q only ifs is more than.

A person swims at a speed of 6 km/h downstream and 2 km/h upstream. His speed in still water is.

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along with the current in 10 minutes. How long will it take to go 6 km in stationary water?

​A man rows at 5km/h in still water. If the river is running at 1km/h, it takes him 75 minutes to row to a place and back. How for is the place?​

Vishal covers 285 km in a boat in 45 hours against the stream and he takes 18 hours with the stream then find the speed of the stream?

A diver rowing at the speed of 3 km/h in still water takes double the time going 50 km upstream compared to going 50 km downstream. The speed of the diver downstream is:

It takes 5 days for a steamboat to travel from A to B along a river. It takes 7 days to return from B to A. How many days will it take for a raft to drift from A to B (assuming all speeds are constant)?