Hey
Distance travelled by Jennifer is 10(1/2)
Explanation:
let x be the distance travelled by Mathew to school and equals (2+1(1/2)) miles.
Then Jennifer travels 3x
given x = 2+1 (1/2) = 3 (1/2) miles
distance travelled by Jennifer
= 3x = 3.3(1/2)
= 3.(7/2) = 21/2 = 10 (1/2) miles
Hope it helps!