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The distance between a and B is 672km. A passenger car and a freight car leave from the two places and meet each other at 3.2km. The passenger car travels 120km per hour, and the freight car travels how many kilometers per hour? [equation solution] There are 162 people in factory a and factory B. the number of people in factory a is equal to 1 / 5 of that in factory B. how many people are there in each factory
1. If a freight car travels x kilometers per hour, then
3.2（120+x）=672
384+3.2x=672
3.2x=288
x=90
A: trucks travel 90 kilometers per hour
2. If there are x workers in factory a, then there are (162-x) workers in factory B,
¼x=1/5(162-x)
The solution of the equation is x = 72, so 162-x = 90
A: there are 72 people in factory a and 90 people in factory B
Xiao Li has been typing a document for three minutes, with an average of 50 words per minute. At this speed, how many minutes will it take to finish the task of typing 400 words?
(400-50 × 3) △ 50 = 250 △ 50 = 5 (minutes) a: it will take 5 minutes to complete the task of typing 400 words
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