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### Question 1

If the speed of a boat in the direction of the stream current is 18 km/h, and the speed of the current is 4 km/h, what would be the speed of the boat against the current?

### Question 2

The speed of a boat in still water, the upstream speed of the boat and the downstream speed of the boat form an A.P.(Arithmetic Progression) whose middle term is $1{1/8}$. What is the speed of the boat in still water?

**A**

$1{1/8}$ units.

**B**

$2{3/7}$ units.

**C**

$2{1/2}$ units.

**D**

$3{3/10}$ units.

**Soln.**

**Ans: a**

Let the speed of the boat in still water be u and the speed of the stream be v. The three speeds are u - v, u and u + v. They are in an A.P. with a common difference equal to v, and u as its middle term. Since u is also the speed of the boat in still water, the required answer is: $1{1/8}$.

### Question 3

A boat has a downstream speed of 6 km/h and an upstream speed of 4 km/h. What is the speed of the boat in still water?

### Question 4

A boat has a speed of 4 km/h in a still stream. What is the speed downstream in a stream that is flowing at a speed of 3 km/h?

**A**

7 kmph.

**B**

8 kmph.

**C**

6 kmph.

**D**

10 kmph.

**Soln.**

**Ans: a**

The downstream speed is the speed along the direction of the flow of the stream. It is equal to the sum of the speed of the boat in still water and the speed of the stream. So the speed downstream is 4 + 3 = 7 km/h.

### Question 5

If the speed of a boat in the direction of the stream current is 24 km/h, and the speed of the current is 8 km/h, what would be the speed of the boat against the current?

This Blog Post/Article "Boats and Streams Quiz Set 011" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2019-08-18.