Explanation:
New speed = 6/7 of typical speed => New time = 7/6 of typical time. Difference = 1/6 of typical time = 14 minutes. Typical time = 14 * 6 = 84 minutes.
Explanation:
Let the time duration be t hours. Difference in distance = 12t - 9t = 3t = 15 km => t = 5 hours. Actual distance traveled = 9 * 5 = 45 km.
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