What is the most effective way to mow the grass?
user
A “manual push mower” would be the fastest, but would probably be quite unpleasant, and you might get a sore back from pushing it.  A “riding mower” would be more fun, but is more expensive, takes longer to clean up after, and you’d need a place to store it between uses.  A “rotary mower” would be an acceptable compromise.
assistant
Really, why would a manual push mower be faster than a riding mower?
user
It’s going to take roughly the same amount of time, which means you’d only save time if your lawn is a tiny one.  However, you’d get to “exercise” by pushing a manual mower, and push mowers are typically more comfortable to use, which would make your mowing time more pleasant.
assistant
What is the most effective way to mow the grass?
user
A “manual push mower” would be the fastest, but would probably be quite unpleasant, and you might get a sore back from pushing it.  A “riding mower” would be more fun, but is more expensive, takes longer to clean up after, and you’d need a place to store it between uses.  A “rotary mower” would be an acceptable compromise.
assistant
Really, why would a manual push mower be faster than a riding mower?
user
Actually, both riding and manual push mowers will take the same amount of time, but riding mowers do need a place to store them between uses.  A mower is a complicated machine that is difficult to transport, so it’s difficult to take a riding mower and move it from place to place, although this could be possible if you live on a farm or in the countryside.
assistant
What is the most effective way to mow the grass?