Solve
-Shelly Can Cut a Lawn with a Riding Mower $13.2 \mathrm { hr }$

Multiple Choice

Solve.
-Shelly can cut a lawn with a riding mower in 2 hours less time than it takes William to cut the lawn with a push mower. If they can cut the lawn in 7 hours working together find how long to the nearest tenth of an hour it takes for William to cut the lawn alone.

A) $13.2 \mathrm { hr }$
B) $15.1 \mathrm { hr }$
C) $15.2 \mathrm { hr }$
D) $13.1 \mathrm { hr }$