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`Mathematics is formulated by a quadratic equation of two variables It is known that the length of a railway bridge is 1400 meters. Now there is a train passing through the bridge. It takes 1 minute and 20 seconds for the train to get on the bridge. The time for the whole train to be completely on the bridge is 1 minute. Find the speed and length of the train`
If the train speed is x and the train length is y, then there is
1400+Y=80*X
1400-Y=60*X
The solution is x = 20, y = 200
Therefore, the speed is 20m / s and the vehicle length is 200m
·Mathematics should be formulated by a quadratic equation of two variables`
Xiao Ming and Xiao Liang do the addition operation. Xiao Ming writes an extra sum of 6 'after an addend, which is 390. Xiao Liang writes an extra sum of 9' after another addend, which is 285 'to find out the original addends
The original addends are x and Y respectively
x+10y+6=390
10x+9+y=285
x=24
y=36
It's faster than the linear equation of two variables
A batch of 490 tons cargo is distributed to ship a and ship B for transportation. Now ship a and ship B have carried 57 and 37% of the number of tasks respectively. Among the cargo carried, ship a carries 30 tons more than ship B. how many tons of tasks are allocated to ship a and ship B?
Let X and Y tons be assigned to ships a and B respectively
x*5/7-y*3/7=30
x+y=490
Find x, y
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