Boats and Streams

If a boat goes 7 km upstream in 42 minutes and the speed of stream is 3kmph, then the speed of the boat in still water is :

• 4.2 kmph         

• 9kmph

• 13kmph

• 21kmph

A boat takes half time in moving a certain distance downstream than upstream. What is the ratio between the rate in still water and the rate of current?

• 1:2

• 2:1

• 1:3

• 3:1

A man rows to a place 48 km distant and back in 14 hours. He finds out that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of stream is

• 1 km/hr

• 1.5km/hr

• 1.8km/hr        

• 3.5 km/hr       

Tags

CCSS.HSA.CED.A.1

A boat goes 30 km upstream and 44km downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55km downstream. The speed of boat in still water is

• 3km/hr

• 4km/hr

•  8km/hr

• None of these

Tags

CCSS.8.EE.C.8C

 A man takes 2.2 times as long to row a distance upstream as to row the same distance downstream. If he can row 55km downstream in 2 hours 30 minutes, what is the speed of the boat in still water?

• 40kmph

• 8kmph

• 16kmph

• 24kmph

A man can row upstream at 10 km/hr and downstream at 18 km/hr. Man's rate in still water in km/hr is

• 14

• 4

• 12

• 10

A boat covers 8 km in one hour along the stream and 2 km in one hour against the stream. The speed of the stream in km/hr is

• 3

• 5

• 2

• 4

Tags

CCSS.HSA.CED.A.1

A man rows downstream 32 km and 14 km upstream. If he takes 6 hours to cover each distance, then the speed of the stream in km/hr is 1

• 1/2

• 1

• 3/2

• 2

Tags

CCSS.8.EE.C.7B

A man rows at a speed of 8 km/hr in still water to a certain distance upstream and back to the starting point in a river which flows at 4 km/hr. The average speed of the journey in

• 12

• 6

• 4

• 8

A boat goes downstream at u km/hr and upstream at v km/hr. The speed of the stream, in km/hr, is

• (u-v)

• u +v