math
posted by alex .
it takes janet 9 hours to do a task and it take jancie 10 hours to do the same task how long will it take both of them to do the task together

janet rate: 1task/9hrs
jancie rate: 1task/10hrs
combinded rate=1task/hr (1/9+1/10)
timecombined=1task/combinded rate
careful with the fractions. 
5 hrs
Respond to this Question
Similar Questions

math
one task takes 7 mins second task takes 12 min third task takes 21 nin how long dids the 3 tasks take, as a fraction of a hour 7/30+12/30+21/30=40/30 =1 1/3 hr is that right? 
MATH
An application of a rational function is T = (AB)/(A+B), which gives the time, T, it takes for two workers to complete a particular task where A & B represent the time it would take for each individual worker to complete the identical … 
college algebra
Find the time for two people working together to complete half a task if it takes them 8 hours and 10 hours to complete the entire task working individually. 
college algebra
Find the time for 2 people working together to complete half of a task if it takes them 8 hours and 10 hours to complete the entire task working individually. Thank you!!! 
Radical and Rational exponents
Estimate how long it takes you to complete a task of your choice (house cleaning, mowing, etc.) in a given week. Suppose that Joe is slower than you at the given task and takes three times as long as you do. If you work together, how … 
College Algebra
Part 1: Using the Library, web resources, and/or other materials, find the average weight in pounds of a type of bird of your choice. Use the rational exponent equation L = 2.43 * W^0.3326 to estimate the wingspan L in feet of the … 
math
if wayne completed a task in one hour and sarah completed a task in two hours, how long will they take if they work together? 
Algebra
One person can complete a task in 3 minutes. A second person can complete the same task in 5 minutes. How long will it take to complete the task of the two people work together? 
math
If A and B work together,they can finish a task in 2 hours. If they do the task separately, B can finish 3 hours earlier than A can. Find the time required for B to finish the task alone. 
Algebra
Working together, Sarah and Jeff can do a task in 6 hours. Jeff uses a motorized cart to do the task, whereas Sarah uses a pushcart. If each person does the task without the help of the other, it takes Sarah twice as long …