A plane flies 72 kilometers in 5 minutes. What's its speed? Km / h? And M / S?

A plane flies 72 kilometers in 5 minutes. What's its speed? Km / h? And M / S?

5 minutes = 1 / 12 hours
v=s/t=72km/1/12h=864km/h=240m/s

A certain kind of aircraft carries out flight training. The speed of flying out is 1200 m / h, and the speed of flying back to the airport is 1500 / h. The fuel in the fuel tank of the aircraft can only maintain 2.5 m / h
Hours of flight, the aircraft can fly up to how many kilometers should return

In terms of an hour's journey, one hour's flight, 1200 meters. If you fly back immediately,
It should take time: 1200 ／ 1500 = 0.8 (hours). That is to say, for a journey of 1200 meters, when one comes and one goes, 1 + 0.8 = 1.8 (hours). In 2.5 hours, how many 1200 can be flown? 2.5 ／ 1.8 = 25 / 18,
Maximum distance: 1200 × 25 / 18 = 1666 and 2 / 3 (m)

An aircraft flies 1500 km per hour downwind and 1200 km per hour upwind. The fuel is enough to fly for 9 hours. When the aircraft takes off downwind, it is necessary to ask how far it flies
Then up: back?

If the plane flies out, it has to return in X hours
1500X =1200×( 9 - X)
1500X =10800 - 1200X
2700X = 10800
X = 4
1500 × 4 = 6000 (km)
The plane has to go back after 6000 kilometers

Can you solve the following problems by using the equation method you have learned? In order to further alleviate traffic congestion, Wuxi City decided to build a light rail from the city center to the airport. In order to complete the project three months ahead of schedule, the original work efficiency needs to be increased by 12%. How many months will it take to complete the project?

Suppose the original plan takes x months to complete the project. According to the meaning of the question, we can get: (1 + 12%) · 1 x = 1 x − 3 solution, x = 28 & nbsp; after testing, x = 28 is the solution of the original equation. Answer: the original plan takes 28 months to complete the project