Question

Joseph and alia can finish science project in 18 hours and 15 hours respectively. find.
work done by Joseph in 6 hours.
work left after Joseph has worked for 6 hours.
time required by Aliya to finish the remaining work.
​

Answer 1

Step-by-step explanation:

Time taken by joseph complete a work = 20 hours.

Time taken by Aliya to complete a work = 25 hours

Joseph's one hour work = 1/20

Peter's one hour work=1/25

So both joseph' and Aliya work in one hour = 1/20 + 1/25

taking LCM = ( 5+ 4 )/ 100 = 9/100

work done by both together in 4 hrs =

100

9

×4=

25

9

Work left after both worked together for 4 hrs =1−

25

9

=

25

(25−9)

=

25

16