Richard is cycling at a speed km/h when he looks at his cycle computer to see how long it will take him to get home at his current speed. It shows a time hours.
He cycles at this speed for minutes, then instantaneously slows down by km/h and checks his cycle computer; the predicted time to get home at his new speed is still hours.
After cycling at this new speed for minutes, he instantaneously slows down by another km/h and checks his cycle computer; the predicted time to get home at this speed is again hours.
How far from home was he when he first looked at the computer?
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