I am unsure of what formula to use for this problem can anyone help me?
Lisa can shovel snow from her driveway in 60 minutes, Jim can do the same job in 55 minutes. How long will it take Lisa and Jim to shovel the driveway if they worked together?
RateforLisa=1drive/60min
rateforJim=1drive/40 min
Now you have one drive to do.
both work the same amountof time.
1drive=ratelisa*time + ratejim(time)
1drive=(drive/60min + drive/40min )time
time=1/(1/60 + 1/40)
multiply the right side by 2400/2400
time=2400/(40+60) and you have it
Thank You!!!
Lisa can showel snow in 55 minutes. Bill can do the same job in 30 minutes. How long would it take if they worked together?
To determine how long it will take Lisa and Jim to shovel the driveway if they work together, we can use the concept of rates or work rates.
First, let's find their individual work rates. Lisa can shovel the driveway in 60 minutes, so her work rate is 1/60 of the job per minute. Jim can do the job in 55 minutes, so his work rate is 1/55 of the job per minute.
To determine their combined work rate when working together, we add their individual work rates. So, their combined work rate is (1/60) + (1/55) = (55 + 60) / (55 * 60) = 115 / 3300.
To find the time it takes for them to finish the job together, we can use the formula:
Time = 1 / Combined Work Rate
Substituting the values, Time = 1 / (115 / 3300) = 3300 / 115 = 28.70 minutes (rounded to two decimal places).
Therefore, it will take approximately 28.70 minutes for Lisa and Jim to shovel the driveway if they work together.