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?

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.

  1. 👍 0
  2. 👎 0
  3. 👁 87

Respond to this Question

First Name

Your Response

Similar Questions

  1. 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,

    asked by Renee on October 26, 2008
  2. 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

    asked by ALGERBRA on October 25, 2007
  3. 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

    asked by Diamond on February 21, 2017
  4. Statistics

    Four people working independently on an assembly line all perform the same task. The time (in minutes) to complete this task for person i (i = 1, 2, 3, 4) has a uniform distribution on the interval [0, i]. Suppose each person

    asked by HERON NITA on March 18, 2019
  5. 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

    asked by alex on November 18, 2008
  6. 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

    asked by p on September 10, 2009
  7. 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

    asked by Nicole on January 25, 2009
  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?

    asked by Fayetta on September 21, 2010
  9. 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!!!

    asked by jenny on October 15, 2008
  10. 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.

    asked by jenny on October 14, 2008

More Similar Questions