Question
Sheila walks at the speed of her usual speed (20/21) and
determines a clear distance in six minutes more than the time it takes in normal speed. Calculate the normal time it takes in determining a certain distance.Solution
Let the speed of the Sheila be 21 unit Speed of the Sheila after decrement = 21 x 20/21 = 20 unit Speed ratio = 21: 20 Time ratio = 20:21 ...[... Time taken is inversely proportional to speed] 21-21= 1 unit 1 unit =6 min 20unit = 6 x 20 = 120 min Total time taken by Sheila at usual speed was 120 min.
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