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"Blessing Beijing" and "blessing the Olympic Games" are the good wishes of every Chinese. Liangliang, Bingbing and Junjun all have a set of three identical cards with the words "blessing", "Beijing" and "Olympic Games" written on the back. They randomly selected one card from their own set, and the three cards contained "blessing", "Beijing" and "Olympic Games" What is the probability of luck______ ．
∵ there are 27 combinations of 3 × 3 × 3 randomly selected, 6 combinations of "blessing", "Beijing" and "Olympic Games" in the three cards, P (including "blessing", "Beijing" and "Olympic Games") = 29
When they meet, the distance between a and B is 4 kilometers more than 7 / 15 of the whole journey. It is known that the speed ratio of a and B is 5:4,
What is the distance between the two places
The proportion of B course to total length = 5 ÷ (5 + 4) = 5 / 9
Distance = 4 ÷ (5 / 9-7 / 15) = 45 km
When they meet, the distance between a and B is 4 kilometers more than 7 / 15 of the whole journey. It is known that the speed ratio of a and B is 5:1
How many kilometers is the distance between the two places?
Suppose the speed ratio is 5:4, let the speed of a be 5V, then the speed of B be 4V, and the distance be s
S = (5V + 4V) t, 5vt-7 / 15s = 4
Party A and Party B ride from both places at the same time. The speed of car a is 15 kilometers per hour, and that of car B is 13 kilometers per hour. When they meet, the distance between them is 3 kilometers from the midpoint. What is the distance between the two places
A is better than B
3 + 3 = 6 (km)
Meeting Time
6 ÷ (15-13) = 3 (hours)
The distance between the two places
3 × (15 + 13) = 84 (km)
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