Question

Dina and Masha started out on a 12 mi bike path at the same time. When Dina reached the end of the 12 mi, Masha still had 3 mi left to bike. If Dina’s biking speed is 8 mph, find Masha’s biking speed.

Answer 1

6mph

Explanation:

Answer 2

6 mph

Explanation:

Use formula

`D=r\cdot t,`

where

D = distance

r = rate

t = time

In your case,

D = 12 mi

Dina:

D = 12 mi

r = 8 mph

t = ?

So,

`12=8t\\ \\t=(12)/(8)=(3)/(2)=1.5\ hours`

Masha:

D = 12 - 3 = 8 mi

r = ?

t = 1.5 hours

Then

`9=1.5r\\ \\r=(9)/(1.5)=(90)/(15)=6\ mph`