Problema Solution
A can do a work in 5 days and B can do the same work in 3 days . In how many days working together can finish the work?
Answer provided by our tutors
A can do a work in 5 days thus the rate of A is 1/5 work/day
B can do the same work in 3 days thus the rate of B is 1/3 work/day
x = the number of days A and B need when working together
the together rate of A and B is: 1/x work/day
1/5 + 1/3 = 1/x
by solving we find:
x = 1.875 days
click here to see the step by step solution of the equation:
1.875 days = 1 day 0.875*24 hr = 1 day 21 hr
A and B can finish the work together in 1 day and 21 hours.