2. 16m Let Rabbit A be x meters away from the finish line. Because the two rabbits advance at a constant speed, the distance they run in the same time is proportional: 40/50 = (80-x)/80; X= 16m, that is, the distance from rabbit A to the finish line is 16m.
3.56.25KM If the distance between Party A and Party B is X, the time for the ship to travel from Party A to Party B is X/25h, and the time for traveling from Party B to Party A is x/ 15h, the total time is X/25+X/15 = 6; Find x=56.25KM.
4.30 days because I read 1/7 in the first five days, so the remaining 6/7 needs: [5/( 1/7)]*(6/7)=30 days.
The design of 5.24 days actually took X days to complete. The original planned number of parts per day was 12000/30=400, but the actual number of parts per day was 400+ 100=500, so x*500= 12000 is x=24 days.
6.42. It takes X people to complete the current plan. According to the original plan, the total project quantity is 35 *18 = 630; Then according to the current scheme x*( 18-3)=630, x=42 people are obtained.