Question
If Seema had run at a speed of 14 km/hr instead of 7
km/hr, she would have covered 20 km more distance. What would have been the actual distance covered by her?Solution
Let the time she ran be t hours. Case 1: At 7 km/h , Distance = 7 × t = 7t Case 2: At 14 km/h, Distance = 14 × t = 14t Acc to the question: If she had run at 14 km/h, she would have covered 20 km more than at 7 km/h: 14 t = 7t + 20 t = 20/7 Now, the actual distance she ran at 7 km/h: 7 x t = 7 x 20/7 = 20 km
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