- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
A bus moves from stop A to stop B with a speed of 40 km/hr and then from stop B to stop A with a speed of 50 km/hr. What is its average speed ?
$Average \ speed = \frac{Total \ distance }{ Total \ time}$
Let the distance from stop A to stop B is D. Therefore total distance traveled is 2D
Hence Average speed = $\frac{2D }{\frac{D}{40} + \frac{D}{50}}$
$= 2 \times 40 \times 50 \div (40 + 50 )$
=> Average speed = 44.4km/h.
Advertisements