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

Answer:

6mph

Step-by-step explanation:

Answer 2

Answer:

6 mph

Step-by-step 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,

$12=8t\\ \\t=\dfrac{12}{8}=\dfrac{3}{2}=1.5\ hours$

Masha:

D = 12 - 3 = 8 mi

r = ?

t = 1.5 hours

Then

$9=1.5r\\ \\r=\dfrac{9}{1.5}=\dfrac{90}{15}=6\ mph$