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Inverse proportion - class-XII
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A car takes 2 hours to reach a destination by travelling at the speed of 60 km/h. when the car travels at the speed of 80 km/h it takes
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A
one and half hour
💡 Explanation:
Let the car takes x hours to reach a destination by travelling at the speed of 80 km/h. Then,
| Speed (in km/hr) | 60 | 80 |
|---|---|---|
| Time (in hours) | 2 | x |
Clearly, more the speed, less will be the time taken. So, it is a case of inverse proportion.
$ \therefore ,,, 60 \times 2 = 80 \times x \Rightarrow x = \displaystyle \frac{60 \times 2}{80} = \frac{3}{2}$
Hence, the time taken will be $\displaystyle 1\frac{1}{2}$ hours.