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A and B start from a to B at the same time. It is known that the speeds of a and B are 80 km / h and 60 km / h respectively. If a and B are x km apart, then
x/60-x/80
Simplify X / 240
Party A and Party B transport a batch of cement together. At the end of the transport, party a transport more than 2 / 5 of the total 14 tons, and Party B transport 1 / 4 more than Party A. how many tons of this batch of cement?
Hello!
2/5x(1+1/4)=2/5x5/4=1/2
14x (1 + 1 / 4) = 14x5 / 4 = 35 / 2 tons
common
（14+35/2）÷（1-1/2-2/5）
=63/2÷1/10
=315 tons
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240 tons of coal is divided into three piles, i.e. pile a, pile B and pile C. pile a is 12 tons less than pile C. the mass ratio of pile B and pile C is 2:5?
(240 + 12) △ 5 + 2 + 5) × 5-12 = 252 △ 12 × 5-12 = 105-12 = 93 (tons) a: there are 93 tons of jiadui coal
The two cars of Party A and Party B start from a to B at the same time. After 3.5 hours, the distance between them is 60 kilometers. It is known that the speed of car B is 1.3 times that of car A. how about the speed of car a and car B?
Let the velocity of a be x, then B be 1.3x
(1.3x-x) * 3.5 = 60 km
So x = 6000 / 105 km / h = 400 / 7 = 57.14 km / h
The speed of B is 1.3x = 74.29km/h
Speed of car a: 60 △ 3.5 △ 1.3-1 = 57 1 / 7 (km)
Speed of vehicle B: 57 1 / 7 × 1.3 = 74 2 / 7 (km)
3.5*0.3X=60,X=400/7,13.X=520/7
Let the speed of car a be X.
（1.3x-x）×3.5=60，x=57.1
The velocity of B is 1.3x = 74.3
A, B and C transported a pile of wheat together. A transported 40% of the total amount, 150 kg more than B. the weight ratio of B and C was 3:2. How many kg did each of the three transport
(1-40%) (3 / 5) = 36%
(1-40%) (2 / 5) = 24%
Total wheat = 150 (40% - 36%) = 3750 (kg)
Jiayun 3750x40% = 1500kg
B transport 3750x36% = 1350kg
C transport 3750x24% = 900kg
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The weight ratio of pile a, pile B and pile C is 2:3:5. The total weight of the three piles is 15 tons. How many tons is a less than B?
2 + 3 + 5 = 10, 15 × 210 = 3 (tons); 15 × 310 = 4.5 (tons); 4.5-3 = 1.5 (tons); or: 15 × (310-210), = 15 × 110, = 1.5 (tons); answer: A is 1.5 tons less than B
Party A and Party B start from city a to city B. Party A starts 50 kilometers ahead of city B, and then Party B starts. The speed of Party A is 60 km / h, and the speed of Party B is 50%
Solve by equation
The speed of car B is 80 km / h. How long does it take B to catch up with a
There is no distance, you can set one
Set the distance a, X hours to catch up
（80-60）x=a-50
50 / (80-60) = 2.5 hours
The title is incomplete
80x-60x=50
x=2.5
A, B and C carried a batch of wheat together. A carried two fifths of the total, 152 kg more than B. the ratio of B to C was 3:2
How many kilos of wheat does a transport?
152÷【2/5-（1-2/5）×3/（3+2）】×2/5
=152÷【2/5-9/25】×2/5
=152÷1/25×2/5
=1520 kg
1520 kg
The total (1-2 / 5) * 3 / (3 + 2) = 9 / 25
A = 152 ÷ (2 / 5-9 / 25) = 3800 kg
The coal in pile a is 20 tons more than that in pile B. If 64 tons are transported out of pile a and 32 tons are transported out of pile B, then the ratio between team a and team B is 3:4,
Come on, look at you
How many tons of coal does a have
64-32-20 = 12 tons
4/3－1＝1/3
12 △ 1 / 3 = 36 tons The amount of coal a pile is now
36 + 64 = 100 tons The original coal quantity of pile a
Can you write your question in white? Question: is it complete
How many kilometers is the distance between a and B?
（35+42）*2=154（km）
35*5/6=29.17（km)
154+29.17=183.17(km)
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