Mary's Journey<br>Mary wanted to start a walking plan but did not know how to begin. She went online and researched walking for exercise. She spoke with a trainer at the YMCA who helped her write a plan. Mary started out walking one block per day, for one week. By the end of the month, she was walking four blocks.
It took mary over 2 hours to walk 4 blocks
( z1 walk :ARG2 ( z2 distance-quantity :quant 4 :unit ( z3 block ) ) :duration ( z4 over :op ( z5 temporal-quantity :quant 2 :unit ( z6 hour ) ) ) )