# math

posted by .

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?

no 2/3

Prinness is correct. There are 60 minutes (not 30) in an hour. So -- your answer would be 40/60 = 2/3 hour.

## Similar Questions

1. ### 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 …
2. ### 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 …
3. ### math

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
4. ### 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 …
5. ### math

need to check answers please 9/11-3/11+7/11=13/11=1 2/11 evaluate then to lowest form One task took 7 minutes (min), a second task took 12 min, and a third task took 21 min. How long did the three tasks take, as a fraction of an hour?
6. ### 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?
7. ### operation management

A firm is planning to set up an assembly line to assemble 40 units per hour. Assume that 57 minutes per hour are productive. The time to perform each task and the tasks preceding each task are as follows: Task Preceding Task Time to …
8. ### Computer Science

Mythical Man question: If it takes one person 3 months to complete a task, why does it take 4 people 6 months to complete the same task?
9. ### 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?
10. ### 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 …

More Similar Questions