Problema Solution
one tractor can plow a field in 8 hours, and another in 10 hours . In how many hours can both tractors plow the field together ?
Answer provided by our tutors
let
x = the number of hours that the both tractors need to plow the field together
1/x filed per hour is the together rate of the both tractors
1/8 fields per hour is the rate of the first tractor
1/10 field per hour is the rate of the second tractor
1/8 + 1/10 = 1/x
by solving we find:
x = 40/9 hr
x = 4.44 hours
click here to see the step by step solution of the equation:
both tractors can plow the field together in 4.44 hours.