If the speed ratio 3:2 then find its time ratio
Answers
The concept of ratio is a very important tool while solving questions in any aptitude-based paper. A lot of calculations can be avoided by applying basic concepts of ratio. In this article we will learn to apply ratio to solve Time, Speed and Distance (TSD) questions.
Basic Concept
The basic formula says Speed= Distance/Time . From this formula, it is evident that speed is directly proportional to distance and inversely proportional to time.
Basically, it means if two objects have their speeds in the ratio a:b,
Distance covered by the two objects in same time will be in the ratio a:b;
Time taken by the two objects to cover same distance will be in the ratio b:a.
Let us apply this concept to some examples given below.
Solved Examples
Example 1: If I travelled at 3/4th of my average speed and reached 25 minutes late, what is the time that I usually take to reach my destination?
Solution: Although this question can be solved by making a simple equation, still the use of ratio can eliminate the calculation-work.
Since, the current speed is 3/4th the average speed, we can take the current speed as 3km/hr and the average speed as 4km/hr so that the ratio of the speeds is 3:4.
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