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Uncle Liu rides a motorcycle to the railway station at an average speed. If he wants to travel 30 kilometers per hour, he will arrive 15 minutes earlier. If he wants to travel 15 kilometers per hour, he will be 5 minutes late
Profit and loss
Scheduled time (30 × 15 + 15 × 5) / (30-15) = 35 minutes
Distance: 30 × (35-15) △ 60 = 10km
The following questions are not complete
Manager Xu drives from home to the railway station, 50 kilometers an hour, 15 minutes earlier than the train. If he walks 40 kilometers an hour, 15 minutes later than the train. He plans to arrive at the fire station 10 minutes earlier than the train. How fast does the manager drive?
Distance from Xujia to railway station = 50 * [2.25-1 / 4] = 100
So the car speed is 100 / [2.25-1 / 6] = 48
If someone rides a bicycle from home to the railway station, if he travels 15 kilometers per hour, he may arrive 15 minutes earlier than the train driving time; if he travels 9 kilometers per hour, he will arrive 15 minutes later than the train driving time. (1) how long does it take to arrive at the railway station on time? (2) how many kilometers should he travel per hour if he plans to arrive 10 minutes earlier than the train driving time?
If the distance from home to the railway station is x km, then x / 15-x / 9 = - 0.5, then x is 11.25 km
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