Question

. Molly travels 90km to get home after work. She leaves at 6pm and arrives home at 7:30pm.

Calculate her average speed in km per hour

Answer 1

60 Kilometers per hour

Explanation:

To solve for how long it took Molly to get home, we can use this equation:

• 7:30 - 6 = 1:30

So, Molly took an hour and 30 minutes, or 90 minutes to travel 90km.

To get the number of km she traveled every hour, we can use this equation:

• 90 ×
  `(2)/(3)` = 60

Why do we multiply by 2/3?

We multiply by
`(2)/(3)` because if we need to figure out the average speed for every hour (60) we need to convert 90 to 60, and to do that we multiply the 90 by
`(2)/(3)`.

Therefore, Molly travels 60km every hour.