Question

mya takes 2 hours to plant 50 flower bulbs. francis takes 3 hours to plant 45 flower bulbs. working together, how long should it take them to plant 150 bulbs?

Answer 1

rate = work / time

For Mya, her rate is:

rate_Mya = 50 bulbs / 2 hours = 25 bulbs/hour

For Francis, his rate is:

rate_Francis = 45 bulbs / 3 hours = 15 bulbs/hour

Working together, their combined rate is:

rate_combined = rate_Mya + rate_Francis

rate_combined = 25 bulbs/hour + 15 bulbs/hour

rate_combined = 40 bulbs/hour

Now we can use the formula again to find the time it takes to plant 150 bulbs:

time = work / rate_combined

time = 150 bulbs / 40 bulbs/hour

time = 3.75 hours

So it would take Mya and Francis working together 3.75 hours (or 3 hours and 45 minutes) to plant 150 flower bulbs.

Explanation: