Kemberlee and Amy are rowing across Gabby's pond. If Kemberlee paddles alone, it takes her 75 minutes. If Amy
paddles alone, it takes her 60 minutes. How long will it
take them if they paddle together?

I'm confused on this could anyone me and show me what i need to do to solve it.

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?