Sara and her sister leave home at the exact same time. sara walks north at a rate of 4 miles per hour. her sister walks east at a rate of 3 miles per hour. what is the straight line distance between the sisters two hours after they leave each other? >

after two hours, the straight line distance between sara and her sister is

a.5
b.10
c. 15

The answer is B

you may try to draw a picture to work out the question

The question require the knowledge of Pythagorean Theorem

Sara walked up 4miles per miles for 2hours .Therefore ,she walked 8miles in total.

her sister walked to the right 3miles per hours for 2hours.Therefore ,she walked 6miles in total .

the distance is
6^2+8^2=x^2
x=10
therefore the answer is B