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Xiao Liang originally planned to go from place a to place B by bike at the speed of 12 km / h, so that he could reach place B within the specified time. However, due to some reasons, he delayed the original planned departure time by 20 minutes, so he had to go at the speed of 15 km / h. as a result, he arrived at place B 4 minutes earlier than the specified time. What is the original planned time? Hurry up, before 10 o'clock, detailed, no detailed points Wrong, it's AB; the distance between two points
Let the distance between a and B be x, 20 minutes = 1 / 3 hour, 4 minutes = 1 / 15 hour
We get X / 12-1 / 3 = x / 15 + 1 / 15
x/12-x/15=2/5
x/60=24/60
x=24
X / 12 = 2 (hours)
A: the planned driving time was 2 hours
9: 53. Can we make it?
Xiao Liang originally planned to go from a to B by bike at the speed of 12 km / h, so that he could reach B at the specified time. However, due to the original plan, the same departure time was delayed by 20 minutes, so he had to go at the speed of 15 km / h. as a result, he arrived at B 4 minutes earlier than the specified time, so as to find the distance between the two places
Suppose the distance between the two places is x km and the original planned time is y hours
12y=x
15（y-0.4）=x
The solution of the equation is y = 2, x = 24
So the distance between the two places is 24km
Note: in the second formula, the delay is 20 minutes and the advance is 4 minutes, so 24 minutes is less used, that is, 0.4 hours. The original plan used y hours, but actually (y-0.4) hours
Someone plans to go from a to B by bike at the speed of 12 kilometers per hour, so that he can arrive at B at the prescribed time, but the original departure time is delayed due to something
In 20 minutes, we had to go at the speed of 15 kilometers per hour. As a result, we arrived at the distance between B and ab four minutes earlier than originally planned
[(20 + 4) / 60 * 12] / (15-12) * 15 = 24 km
Set a distance of X kilometers, according to the time
X/12=X/15+(20+4)/60
5X=4X+24
X=24
Mr. Li originally planned to ride from place a to place B for a meeting at the speed of 12 kilometers per hour, but he delayed the original plan for 20 minutes
We had to go at a speed of 15 kilometers per hour. As a result, we arrived at place B four minutes earlier than the specified time to find the distance between the two places
The distance between the two places is x km, there are
X/12=X/15+20/60+4/60
X/60=24/60
X=24
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