Mary is walking 3 miles per hour jerry starts jogging at a rate of 4 miles per hour after marry has been walking for 15 minuets jerry jogs 2 miles as mary continues walking and they both stop at the same time

Missing question: Determine the distanced covered by Mary.

Solution:
Mary: 3 mph
Jerry: 4 mph
Jerry starts jogging after Mary had been walking for 15 minutes.

Distance Mary had walked before Jerry starts jogging = Speed * Time = 3*15/60 = 0.75 miles.

Time taken by Jerry to jog for 2 miles = Distance/Speed = 2/4 =1/2 = 0.5 hrs.
Since they stopped at the same  time,
Distance Mary walked while Jerry jogged = Speed* Time = 3*0.5 = 1.5 miles

Therefore,
Total distance Mary walked = 0.75+1.5 = 2.25 miles.