1/( 1 1+ 14)= 1/25
35 (7/12-1/25x14) =1500 (Ben)
8 A project takes Party A 10 days, and Party B completes it in 30 days. Now two people cooperate, during which Party A takes two days off and Party B takes eight days off (two people take the same day off). So, how many days did it take from the beginning to the completion of task one?
( 1+ 1/ 10 x2+ 1/30 x8)÷( 1/ 10+ 1/30)= 165438+
A truck and a bus go from A to B at the same time. When the freight car is 270KM away from B, the bus has already traveled to the midpoint of the whole journey. At this speed, when the bus arrives at point B, the truck has already traveled eight tenths of the whole journey. What is the distance between a and b?
Speed ratio: truck: bus = 8/9: 1 = 8: 9.
270 ÷ (1-1/2 ÷ 9x8) = 486 (km)