Question

What is the average speed that robin mus drive to reach her friend's house 170 miles away in 2 1/2 hr

Answer 1

`v = d / t`

`v = (170 \: mi * 1.609 \: km) / 2.5 \: hrs`

`v = 273.53 \: km / 2.5 \: hrs`

`v = 109.412 \: kmhr - 1`
The average speed is 109.412 kilometers per hour.

Answer 2

68 miles / hour

Average speed = distance / time

distance = 170 and time = 5/2 ( as an improper fraction)

speed = 170 ÷
`(5)/(2)` = 170 ×
`(2)/(5)` =
`(340)/(5)` = 68