Question

To catch an 8:30 am bus, Kendra needs 45 minutes to shower and dress, 20 minutes to eat, and 10 minutes to walk to the bus. When should she wake up to get to the bus on time?

Answer 1

On or before 7:15am

Explanation:

Given:
Bus leaves at: 8:30 am
Shower and Dress = 45 mins
Eat = 20 mins
Walk to the bus = 10 mins

In order to get the time Kendra needs to wake up in order to be able to catch the bus, we should compute for the total time she needs to prepare (shower, dress, and eat) and walk to the bus.

So let t = Kendra's total prep time
`t = shower and dress + eat + walk`
`t = 45 min + 20 min + 10 min`
`t = 75 min`
`t = 1 hour 15 min`

In this case, we know that Kendra needs to wake up at least 75 minutes (or 1 hour 15 minutes) before 8:30 am in order to catch the bus.

1 hour 15 minutes before 8:30am would be 7:15am

Hence Kendra needs to wake up at 7:15am in order to catch the bus leaving at 8:30am