Headwind: 6*24= 144 (km)

(If the wind direction is favorable, the first one is needed; if the wind direction is unfavorable, the second one is needed. )

A: The distance between the two cities is 132( 144) kilometers.

2、3+4=7

4-3= 1

54*7=378 (person)

A: There are 378 people in Workshop A and Workshop B. ..