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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 at 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 to find the distance between a and B
Suppose the distance between a and B is x, then there is
X / 12 = x / 15 + (20-4) / 60, x = 16 (km)
Party A and Party B go from a to B. Party B leaves three hours after Party A leaves, and Party B arrives one hour earlier than Party A. the distance between two places is 120km, and Party A is two-thirds of Party B,
Four of them
Why are there four? Is there a formula
Suppose B's speed is x km / h, then a's speed is 2 / 3x km / h
120÷X+4=120÷2/3X
X=15
That is, the speed of B is 15 km / h
Then a's speed is 10 km / h
The distance between AB and B is 120km. A and B leave each other and meet in three fourths of an hour. The speed ratio of a and B is 5:3. How many more lines does a travel than B
Kilometers?
There is a condition that is redundant, that is, 3 / 4 hour meeting
A runs 120 * (5-3) / (5 + 3) = 30 km more than B
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