Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

A boat has a speed of 8 km/h in a still stream. What is the speed downstream in a stream that is flowing at a speed of 6 km/h?

**A**

14 kmph.

**B**

15 kmph.

**C**

13 kmph.

**D**

17 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 8 + 6 = 14 km/h.

### Question 2

A man can row a boat at the rate of 14 km/h in still water, and at the rate of 8 km/h against the stream. At what rate can he row down the stream?

### Question 3

The speed of a boat in still water is 16 km/h and rate of flow of the stream is 8 km/h. If it travels upstream for 7 hours, what is the distance travelled by the boat during the journey?

### Question 4

The upstream journey of a boat takes 8 times the time it takes it to complete the downstream journey. What is the ratio of the speed of the boat in still water to the speed of the stream?

**A**

$1{2/7}$.

**B**

$2{2/3}$.

**C**

${2/9}$.

**D**

$3{1/3}$.

**Soln.**

**Ans: a**

Let the distance be L and the speed of the boat in still water be u, with v being the speed of the stream. We are given $L/{u - v} = 8 × L/{u + v}$. We can solve this equation for u/v to get u/v = ${8 + 1}/{8 - 1}$ = $1{2/7}$.

### Question 5

A boat has a downstream speed of 16 km/h and an upstream speed of 12 km/h. What is the speed of the boat in still water?

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This Blog Post/Article "Boats and Streams Quiz Set 008" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2019-08-18.