Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

A boy walks along the three edges of an equilateral triangle at average speeds of 5 km/h, 9 km/h and 9 km/h. What is the average speed along the whole journey?

**A**

$7{2/19}$ kmph.

**B**

$8{5/9}$ kmph.

**C**

$5{11/21}$ kmph.

**D**

$9{1/7}$ kmph.

**Soln.**

**Ans: a**

Let the edge of the triangle be L. Total distance travelled = 3L. Time taken = $L/5 + L/9 + L/9$. So overall average speed = ${3L}/{L/5 + L/9 + L/9}$ which simplifies to ${135/19}$, which is same as: $7{2/19}$ km/h.

### Question 2

Speeds of A and B are in the ratio 12 : 17. What is the speed of A if B can cover a distance of 34 Km in 1 hour?

### Question 3

A car is moving at a speed of 72 kmph. What is the speed in m/s?

### Question 4

An aircraft was on a 1360 km journey. Its engine developed a snag so it had to slow down. It's average speed reduced by 5km/h, as a result of which it reached its destination late by 1 hour. What was the actual duration of the journey?

### Question 5

Speeds of A and B are in the ratio 7 : 9. What is the ratio of the times that they will take to cover a distance of 100 km?

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This Blog Post/Article "Distance and Time Quiz Set 015" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2019-08-18.