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If the speed of a car is increased by 20%, it can arrive one hour earlier than the original time. If it is 5 kilometers faster than the original speed per hour, Then you can save 1 / 9 of the time. How many kilometers is the distance between a and B Then you can save 1 / 9 of the time. How many kilometers is the distance between a and B
If the vehicle speed is increased by 20%, the time required to complete the whole journey becomes 1 △ 1 + 20% = 5 / 6 of the original time,
It can be concluded that the original time is 1 (1-5 / 6) = 6 hours;
When the time required to complete the whole journey becomes 1-1 / 9 of the original time = 8 / 9, then the speed becomes 1 △ 8 / 9 of the original speed = 9 / 8,
The results show that the original speed is 5 ÷ (9 / 8-1) = 40 km / h;
Therefore, the distance between a and B is 40 × 6 = 240 km
A car from a to B can arrive one hour ahead of time. If the first 100 kilometers are driven at the same speed, it can still arrive one hour ahead of time. How many kilometers are there between a and B?
If the speed of a car from a to B increases by 20%, it can arrive one hour earlier. If the speed of the first 100 kilometers increases by 30%, it can still arrive one hour earlier?
Speed increased by 20%, time reduced by 1-1 / (1 + 20%) = 1 / 6
It used to take 1 / (1 / 6) = 6 hours
If they are all increased by 30%, the time should be reduced: 1-1 / (1 + 30%) = 3 / 13 yes
6 * 3 / 13 = 18 / 13 hours, less 18 / 13-1 = 5 / 13 hours
The distance between a and B is x km
100：X=5/13：18/13
X=360
If you increase the speed by 20%, you can arrive one hour earlier than the original time. If you drive 120 kilometers at the original speed, you will be able to get there,
Then how many kilometers are there between a and B?
2. A car from city a to city B has driven 280 kilometers in 4 hours, which is just five seventh of the whole journey. At this speed, how many hours does it take to complete the whole journey? And it needs to be solved in proportion
2. Distance = 280 divided by 5 / 7 = 392km speed = 280 divided by 4 = 70km / h whole journey time = distance (392) divided by speed (70) = 5.6 hours, namely 5 hours and 40 minutes
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