Prawns, let me ask a question: During the spring outing, Xiaoying missed the bus and took a taxi to catch up at 80km per hour. 1.5 hours to catch up to 90km per hour and 40 minutes to catch up. Ask a

Prawns, let me ask a question: During the spring outing, Xiaoying missed the bus and took a taxi to catch up at 80km per hour. 1.5 hours to catch up to 90km per hour and 40 minutes to catch up. Ask about the speed of the tour bus.

Solution: Suppose the speed of the tourist bus is x kilometers per hour

Equivalent relationship: The distance between Xiaoying and the tourist bus is equal

1.5(80-x )=40/60*(90-x)

120-1.5x=60-2/3*x

1.5x-2/3x=120-60

5/6x=60

x=60*6/5

x=72

Answer: The speed of the tourist bus is 72 thousand per hour m