# Quantitative Aptitude - Time and Distance - Formula & Concept Tutorial

**Speed**= Distance / Time**Time**= Distance / Speed**Distance**= Speed * Time**Average Speed**= Total Distance / Total Time Taken- To convert
**km/hr**to**m/sec**

**x km/hr** = ( x * 5/18) **m/sec**

- To convert m/sec to km/hr

**x m/sec** = (x * 18/5) **km/hr**

- If the ratio of the speed of A and B is a : b , then the ratio of the times taken by them to cover the same distance is
- Suppose a man cover a certain distance at x km/hr and an equal distance at y km/hr. Then the average speed during the whole journey is .
- When object are
**moving in the same direction**with x and y speed, then relative speed will be x-y. - When object are
**moving in the opposite direction**with x and y speed, then relative speed will be x+y