Question

Need help with 22 and please gives explanation

Answer 1

45 mi/h

Explanation:

Here, we can find the total distance divided by the total time. To find the total time, we can set up 2 equations:

`d = vt` (which is the formula that connects velocity, time and displacement).

Here, we have to split the trip into 2 displacements because the car changes speed. So, we have 40 mi = 40 (mi/h) * t1. And t2 = 1 hour. For the second distance: 20 mi = 60 (mi/h) * t2. And t2 = 1/3 hrs.

since total time = t1+t2, we get the total time is 4/3 hours. Then, we get:

80 =
`v_(avg)`*(4/3) where
`v_(avg)` is the average velocity of the trip. Finally, we get
`v_(avg)` = 45 mi/h