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Anonymous users2024-02-101) It will take 6 hours: According to the meaning of the title, when the two cars meet, A travels 2 5, so B has already driven the whole 3 5 and used 9 hours, so the column formula (3 5) 9 = 1 15, and the remaining 2 5 distance: (2 5) (1 15) = 6, so it will take 6 hours.
2) B takes 20 days and can be done individually.
v A = 1 30, v B = 1 20
So the sum of 1 divided by 1 30 + 1 20 = 12 (days).
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Anonymous users2024-02-093/3 divided by 9 = 1/15
2/5 divided by 1/15 = 6 (hour).
Divide by 1/30 plus 4 points of 1 sum = 12 days.
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Anonymous users2024-02-081 2/5 3/5
Car B is complete.
9 3/5 15 hours.
Car B has to go all the way.
15 9 6 hours.
1/4 5 = 1/20.
1 (1/20 + 1/30) = 12 (days) or: 3/3 divided by 9 = 1/15
2/5 divided by 1/15 = 6 (hour).
Divide by 1/30 plus 4 points 1 divided by 5 and sum = 12 days.
Analysis: 1) Car B travels three-fifths of the way for 9 hours, and the rest is two-fifths, first find the unit one, and then divide it into two-fifths 9 divided by three-fifths and multiply two-fifths.
2) First find the sum of the work efficiency of team A and B, of course, it is expressed by fractions, and then divide unit 1 by work efficiency, and get 1/4 of the working time divided by 5, plus 1/30, find the sum, and then divide 1 by this number 1 (1 4 5 + 1 30).
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Anonymous users2024-02-071) 9 3/5 15 hours 15 9 6 hours.
2) 1 divided by (1/20 + 1/30) = 12 (days).
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Anonymous users2024-02-06Car B is complete.
9 3/5 15 hours.
Car B has to go all the way.
15 9 6 hours.
or 1/4 5 = 1/20.
1 (1/20 + 1/30) = 12 (days).
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Anonymous users2024-02-051) Car B travels three-fifths for 9 hours, and the rest is two-fifths, first find out the unit one, and then divide it into two-fifths 9 divided by three-fifths multiplied by two-fifths.
2) First find the sum of the work efficiency of the second team A and B, of course, it is expressed by the fraction, and then divide the unit 1 by the work efficiency, and get the working time 1/4 divided by 5, plus 1/30, find the sum, and then divide 1 by this number 1 (1 4 5 + 1 30) or 4/1 5 = 1/20.
1 (1/20 + 1/30) = 12 (days).
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Anonymous users2024-02-04When they met, car B traveled the whole way.
1 2/5 3/5
Car B is complete.
9 3/5 15 hours.
Car B has to go all the way.
15 9 6 hours.
1/4 5 = 1/20.
1 (1/20 + 1/30) = 12 (days).
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