Disha cycles to her school at an speed of 12km/hr. It takes her 20 minutes to reach the school. If she wants to reach her school in 15 minutes, what should be her average speed.? (Inverse Variation Method)
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In both the cases distance covered is the same. Let new speed be x km/hr.
Therefore, product of speed and distance will remain constant. First you have to convert time into hours by dividing minutes by 60 since 1 hour is equal to 60 minutes.
12 × (20/60) = x × (15/60)
12 × 1/3 = x × 1/4
4 = x × 1/4
therefore, x = 16 km/hr.
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