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Let Terry's speed = x km/h Time taken to complete 15 kms course = 15/x hours If Terry's speed is hiked by 0.5 km/h i.e., x+0.5 km/h Time taken to complete 15 kms course = 15/(x+0.5) hours According to the question 15/(x+0.5) = 15/x - 1 15/(x+0.5) = (15-x)/x By cross multiplication (15)*(x) =...

Difference of speed = 25 mph - 15 mph = 10 mph Length of the train = 1/4 mile Time taken by the train to pass the boy = 1/4 * 1/10 = 1 / 40 Hours i.e., 1 / 40 * 60 = 1.5 minutes