Worker A Takes 8 Hours To Do A Job. Worker B Takes 10 Hours To Do A J

1.	Worker A Takes 8 Hours To Do A Job. Worker B Takes 10 Hours To Do A Job. How Long Should It Take Both A And B, Working Together To Do The Same Job ?
Answer» FIRST we need to calculate 1 HOURS work, then their COLLECTIVE work as A's 1-hour work is 1/8 B's 1-hour work is 1/10 (A+B)'s 1 hour work = 1/8 + 1/10= 9/40 So both will finish the work in 40/9 hours=4 4/9 first we need to calculate 1 hours work, then their collective work as A's 1-hour work is 1/8 B's 1-hour work is 1/10 (A+B)'s 1 hour work = 1/8 + 1/10= 9/40 So both will finish the work in 40/9 hours=4 4/9

Worker A Takes 8 Hours To Do A Job. Worker B Takes 10 Hours To Do A Job. How Long Should It Take Both A And B, Working Together To Do The Same Job ?

Answer»

FIRST we need to calculate 1 HOURS work, then their COLLECTIVE work as A's 1-hour work is 1/8

B's 1-hour work is 1/10

(A+B)'s 1 hour work = 1/8 + 1/10= 9/40

So both will finish the work in 40/9 hours=4 4/9

first we need to calculate 1 hours work, then their collective work as A's 1-hour work is 1/8

B's 1-hour work is 1/10

(A+B)'s 1 hour work = 1/8 + 1/10= 9/40

So both will finish the work in 40/9 hours=4 4/9