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Question 1
An airplane can travel at 2 km/h in still air. But it takes thrice as much time to travel upstream as compared to the time it takes downstream, if air is blowing at a rate of R km/h. What is R?
Question 2
An airplane can travel at $1{5/9}$ km/h in still air. But it takes thrice as much time to travel upstream as compared to the time it takes downstream, if air is blowing at a rate of R km/h. What is R?
Question 3
A boat can travel 192 km downstream in 12 hours. If it covers the same distance upstream in 32 hours, what is the rate of flow of the stream?
5 kmph.
6 kmph.
4 kmph.
8 kmph.
Ans: a
The downstream speed = $192/12$ = 16 km/h, and the upstream speed = $192/32$ = 6 km/h. By the shortcut method, the speed of the stream is half of the difference between the downstream and upstream speeds of the boat. So the required speed = ${16 - 6}/2$ = 5 km/h.
Question 4
The speed of a boat in still water is 16 km/h and rate of flow of the stream is 6 km/h. If it travels upstream for 6 hours, what is the distance travelled by the boat during the journey?
Question 5
A man can row a boat at the rate of 14 km/h in still water, and at the rate of 4 km/h against the stream. At what rate can he row down the stream?
This Blog Post/Article "Boats and Streams Quiz Set 004" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2020-02-07. Published on: 2016-05-06