(1) Two workers work as a team to unload a lorry carrying 40 sacks of sand, each weighing 60 kg. Before beginning, they receive instructions from their foreman. Man A climbs onto the tailboard of the lorry while Man B obtains a forklift truck.

(2) During unloading, their working procedures are as follows:
- Man B drives his forklift truck alongside the lorry and positions it.
- Man A stands on the lorry and dumps a 60 kg sack onto a pallet on the forklift truck.
- Man B positions each sack as it is dumped on the pallet.
- A total of 10 sacks of sand must be dumped by Man A onto each forklift truck before moving to another empty forklift.
- When 10 sacks have been unloaded, Man B drives to the storeroom, releases the pallet, and returns to the lorry with an empty one.

(3) When the 40 sacks are unloaded, Man A climbs down from the lorry and reports to the clerk's office for further instructions. Man B reports to the foreman.

Durations for the relevant activities:
- Receive instructions from foreman before unloading: 2.0 minutes
- Man A climbs onto the lorry: 1.0 minute
- Man B obtains a forklift truck: 1.4 minutes
- Position forklift truck: 0.6 minute
- Dump sack on pallet: 0.5 minute
- Position sack on pallet: 0.6 minute
- Drive pallet load to storeroom and release: 2.0 minutes
- Return with empty pallet: 1.8 minutes
- Man A reports to the clerk's office: 2.4 minutes
- Man B reports to the foreman: 2.1 minutes

Tasks:
1. Draw a multiple activity chart and determine the utilization of each worker and of the team.
2. The team is now increased to three workers. The third person, Man C, drives another forklift truck and performs the same duties as Man B. Assuming that both Man B and Man C can start their tasks simultaneously, construct another multiple activity chart and determine the utilization of each worker and of the team.
3. Determine which is the more effective method: the team of two workers or the team of three workers.