- 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
Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is
As given,
Distance between home and school $=3\ km$
Time to reach school $=30\ minutes=\frac{1}{2}\ h$
Time taken to come back from the school $=20\ m=\frac{20}{60}\ h=\frac{1}{3}\ h$
So, the average speed of the Boojho $=\frac{total\ distance}{total time}$
$=\frac{3\ km+3\ km}{\frac{1}{2}\ h+\frac{1}{3}\ h}$
$=\frac{6\ km}{\frac{5}{6}\ h}$
$=\frac{36}{5}\ km/h$
$=7.2\ km/h$
Advertisements