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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?

**A**

5 kmph.

**B**

6 kmph.

**C**

4 kmph.

**D**

8 kmph.

**Soln.**

**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