Question

Rachel and Amanda are planting tulip bulbs. Rachel has planted 36 bulbs and is planting at a rate of 15 bulbs per hour. Amanda is planting at a rate of 18 bulbs per hour and has planted 30 bulbs. How long will it take Rachel and Amanda to plant the same number of bulbs? How many bulbs will that be?

Answer 1

Explanation:

This problem is on the combined work rate.

step one:

given that Rachel has plants at 15 bulbs per hour

and Amanda plants at 30 bulbs per hour

1/15+1/18=1/T

18+15/270=1/T

33/270=1/T

11/90=1/T