Hello, could someone me out with these questions?
it takes 8 hours for one crew to clean an office building. it takes a second crew 10 hours to clean the same building. if the first crew works 2 hours and leaves and the second crew takes over to complete the job, how long will it take the second crew to finish cleaning the building?
two rsm students are standing 20ft apart and spot mrs. rifkin. if they immediately run opposite directions with speeds of 300ft/min and 200ft/min, how many minutes will pass until they are 3,000ft apart?