$(1)$

$(2)$

$(3)$

The most work is done in case $1.$

Cases $1$ and $3$ involve the same amount of work, which is more than is involved in case $2.$

Cases $2$ and $3$ involve the same amount of work, which is more than is involved in case $1.$

All three cases involve the same work.

The most work is done in case $2.$

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