what is the total distance mary and jerry combined walked around the track

Question

mary walks at a constant rate of 3 miles per hour

jerry jogs at a constant rate of 4 miles per hour after mary has been walking for 15 min.

jerry jogs 2 miles as mary continues walking and they both stop at the same time

Answer 1

Since Jerry has traveled 2 miles, this means that he has been moving for 30 minutes (half an hour.)

 

Mary has walked 15 minutes longer than Jerry, so she has walked for 45 minutes (3/4 of an hour.)

 

If she walks 3 miles in one hour, in 3/4 of an hour she walks 3*3/4=9/4=2 & 1/4 miles.

 

In total, she and Jerry walked 4 and 1/4 miles.