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The speed ratio of car a and car B is 2:3. It is known that car a takes 9 hours to complete the whole journey, so the meeting time of the two cars is () hours
Set a 2 copies per hour, B 3 copies per hour
The distance between the two places is 9 × 2 = 18
2 + 3 = 5 per hour
The time for the two cars to meet is 18 △ 5 = 3.6 hours
The speed ratio of car a and car B is 2:3. It is known that car a takes 9 hours to complete the journey, so
The speed ratio of car a and car B is 2:3. It is known that car a takes 9 hours to complete the whole journey, so the meeting time of the two cars is () hours
Set a 2 copies per hour, B 3 copies per hour
The distance between the two places is 9 × 2 = 18
2 + 3 = 5 per hour
The time for the two cars to meet is 18 △ 5 = 3.6 hours
A and B start from two places at the same time and run in opposite directions. They meet in 5 hours. After meeting, a continues to drive for 3 hours to arrive at B. how long does it take B to complete the whole journey
Let AB be unit length "1", then
A speed is: 1 / 8 (length unit / hour)
B speed is: (1-1 / 8 * 5) / 5 = 3 / 40 (length unit / hour)
B car shop needs to:
1 / 3 / 40 = 40 / 3 hours
B's speed is two-thirds of a's. two people start from a and B at the same time. If they walk in opposite directions for one hour, they meet each other. If they walk in the same direction, how long does it take for a to get to B?
It is known that the speed of B is two-thirds of that of A. It can be assumed that the speed of a is 3x km / h and that of B is 2x km / h
It is known that the distance between a and B is 3x + 2x = 5x km;
If they go in the same direction, it will take 5 x / (3x - 2x) = 5 hours for a to catch up with B
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