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The distance between a and B is 140 km. It takes 2.5 hours for a car to go from a to B, and it takes less than 1 hour to return. What is the average speed of this car?
140 × 2 ^ (2.5 + 2.5-1) = 280 ^ 4 = 70 (km) a: the average speed of this car is 70 km / h
A and B both rode bicycles and motorcycles from place a to place B. A traveled 20km per hour. B didn't set out until two hours after a set out. As a result, B took four hours to catch up with a and find out B's speed
Equation!
You need it urgently!
Let the velocity of B be X
20*（4+2）=X*4
120=4X
X=120/4
X=30
A: B's speed is 30 km / h
It takes 5 hours for Xiao Wang to go from city a to city B by motorcycle. It takes 10 hours for Xiao Li to go from city B to city a by bike. The two people leave each other from the two cities at the same time. When they meet, Xiao Wang is 192 kilometers away from city B. what's the distance between the two cities?
A: the distance between the two cities is 576 km
It takes 10 hours for Zhang Ming to go from city a to city B by motorcycle, and 15 hours for Li Chun to go from city B to city a by bike. They set out from the opposite cities at the same time
Zhang Ming was 84 kilometers away from city B when he met. How many kilometers is the distance between city a and city B?
The time is: 1 ÷ (1 / 10 + 1 / 15) = 6 hours
Distance a takes: 6 × 1 / 10 = 3 / 5
The remaining distance is: 1-3 / 5 = 2 / 5km, that is 84km
Total distance: 84 △ 2 / 5 = 210km
A: the whole journey is 210km long
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