Xiao Zhang and his father are scheduled to take the bus at home to the railway station to visit his grandfather in his hometown. Half the way, Xiao Zhang asks the driver when he arrives at the railway station. The driver estimates that the train will just leave when he continues to take the bus to the railway station. According to the driver's advice, Xiao Zhang and his father immediately get off the bus and take a taxi. The speed is doubled, so they catch the fire The bus arrives at the railway station 15 minutes before departure. It is known that the average speed of the bus is 30 km / h. how far is it from Xiaozhang to the railway station?

According to the time difference, we can set up a linear equation of one variable: 160x-1120 x = 14, that is: 1120 x = 14, the solution is: x = 30 km

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1. Xiao Zhang and his father take the bus to the railway station. After 1 / 3 of the bus, it is estimated that if they continue to take the bus, they will arrive at the railway station 30 minutes after the train, and then get off and change for a taxi As a result, the bus arrived at the railway station 15 minutes before the train started. It is known that the average speed of the bus is 40 kilometers per hour. How far is it from Xiaozhang to the railway station?
2. Xiao Ming's father drove from home to the railway station at the speed of 50 km / h, 15 minutes earlier than the train. If he drove at the speed of 40 km / h, he was 15 minutes later than the train. How fast did he arrive 10 minutes earlier than the train?
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