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An engineering team has built a highway, which is 1200 meters long. At this time, the ratio of the length of the highway to that of the highway is 3:10, What's the length of this highway?
At this time, the ratio of the length of the built road to that of this road is 3:10
Repaired: not repaired = 3:10-3 = 3:7
3:7=1200：x
x=2800
The engineering team plans to build a 1200 meter long highway
The project team plans to build a road of 1200 meters. After adopting the new construction scheme, the actual length of the road built every day is 15 meters longer than the original plan, thus shortening the construction period
(1) How many days will it take to build this section of road? How many days will it take to build this section of road?
(2) How many days has the actual construction period of the road been shortened compared with the original plan?
(1) the number of days needed for the original plan to build this section of road = the length of the road / the length of the road to be built every day = 1200 / X days. The number of days used for the actual construction of this section of road = the length of the road / the actual length of the road to be built every day = 1200 / (x + 15)
An engineering team built a 1200 meter long highway, and 4 / 15 of it was built in eight days. According to this calculation, how many days will it take to complete the highway? (use proportion solution) pay attention to the proportion
Set a total of X days
4/15:1=8:x
x=8x1÷4/15
x=30
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