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A bus goes from place a to place B at the speed of 80 kilometers per hour, while a truck goes from place B to place a at the speed of 60 kilometers per hour. After 3.5 hours, the two cars meet. How many kilometers are the two places long?
80+60=140
The highway from place a to place B is 250 km long. A bus and a truck drive from place a to place B at the same time. The bus travels 100 km per hour, and the truck 80 km per hour. When the bus arrives at place B, how many kilometers is the truck away from place B?
250-80 × (250 △ 100), = 250-80 × 2.5, = 250-200, = 50 (km); a: the truck is 50 km away from B
Both passenger cars and freight cars go from place a to place B. passenger cars travel 80 kilometers per hour for 6 hours. Freight cars travel 60 kilometers per hour for 8 hours
Write out the time ratio and speed ratio of passenger car and freight car respectively, and then calculate the ratio respectively
Two more questions:
1. The water consumption of the school in October was 10% less than that in September. 1. 18 tons of water was saved in October. How many tons of water was used in September?
2. There are 30 people in the technology group, which is 5 / 6 of the number in the biology group. The number in the biology group is 2 / 3 of the number in the chorus. How many people are in the chorus?
Time ratio: 6:8 = 3:4. Ratio: 3 divided by 4 = 3 / 4 speed ratio: [speed ratio and time are inversely proportional, so 4:3, ratio 4 / 3] should be like this. 0 time ratio: 6:8 = 3:4. Ratio: 3 divided by 4 = 3 / 4 speed ratio: [speed ratio and time are inversely proportional, so 4:3, ratio 4 / 3] should be like this
From place a to place B, buses travel 60 kilometers per hour, and trucks travel 80 kilometers per hour on average. Two cars leave each other in a day. When they meet, buses travel 150 kilometers
How many kilometers is the distance between a and B
The speed of passenger cars is 60 kilometers per hour, and that of freight cars is 80 kilometers per hour,
The speed sum of the two cars is 60 + 80 = 140 km / h,
When we met, did the bus run for 15 hours? So did the truck,
140 x 15 = 70 x 30 = 2100km
The distance between the two places is 2100 kilometers
When meeting, if the bus is 15 km long, then 15 / 60 = 1 / 4, the two cars will meet after driving for 1 / 4 hour
140 x 1 / 4 = 70 / 2 = 35 km
The distance between the two places is 35 kilometers
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