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The distance between AB and a is 600 km. The two vehicles of a and B travel from ab at the same time. They can meet each other in 12 hours. However, if a runs for 2 hours and B runs for 3 hours So they can only travel 1 / 5 of the whole journey. How long does it take to complete the whole journey alone?
1/5-1/12x2=1/30
1/12-1/30=1/20
1 △ 1 / 20 = 20 hours
Party A and Party B start from both sides of AB at the same time and travel in opposite directions. The speed of car B is 4 / 5 of that of car A. one hour after starting, car B stops for half an hour due to fault, and then continues to drive at 3 / 4 of the original speed. It meets car a at 37.5km from the end of ab. the meeting time is 3 / 8 hours later than the original scheduled meeting time. What is the total length? (270)
After driving at the original speed for 1 hour, car B stops for 1 / 2 hour, and the driving distance is equivalent to driving at 3 / 4 of the original speed. After driving at 1 △ (3 / 4) = 4 / 3 hour, car B stops for 1 + 1 / 2-4 / 3 = 1 / 6 hour. If car B runs at 3 / 4 of the original speed and stops for 1 / 6 hour, it will travel 1 / 6 hour less than car a
Party A and Party B both from AB two places at the same time, 12 hours meet
Party A and Party B both go from AB to each other at the same time. They meet in 12 hours. If Party A starts with 5 small things first, and then Party B starts, they meet in 9 hours. Ask how many hours each of them needs to go through the journey of ab. do not copy the binary linear equation!
1. It takes x hours for a and Y hours for B
1/x+1/y=1/12
(5+9)/x+9/x=1
x=16
y=48
2. Let a's velocity be x and B's velocity be y (take the distance as unit "1")
X + y = 1 / 12 (velocity sum)
13x+9x=1
x=1/16
y=1/48
It takes 16 hours for a and 48 hours for B
It is known that a and B are 600 kilometers apart, and a and B are facing each other at the same time. They can meet in 12 hours. However, if a runs for 2 hours and B runs for 3 hours, then they can only travel 1 / 5 of the whole journey. How many kilometers does it take for a to complete the whole journey alone?
1 / 5-1 / 12x2 = 1 / 30 1 / 12-1 / 30 = 1 / 20 1 △ 1 / 20 = 20 hours
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