Problema Solution
Ann can process a batch of film in 8 hours. Barbara can do the work in 10 hours. how long will it take them together to process the film?
Answer provided by our tutors
the rate of Ann is 1/8 films per hour
the rate of Barbara is 1/10 films per hour
let x = the hours they need to process the film together that is they have rate of 1/x films per hour
1/8 + 1/10 = 1/x
by solving we find
x = 40/9 hr
x = 4 hr 4*60/9 min
x = 4 hr 26 min 4*60/9 sec
x = 4 hr 26 min 27 sec
click here to see the step by step solution of the system of equations
together they will process the film in 4 hr 26 min 27 sec.