Answer:
52.5 days
Step-by-step explanation:
Ten people can dig 2 acres in 7 days.
One person can dig 0.2 acres in 7 days.
Working at half the rate, one person can dig 0.1 acre in 7 days.
8 people can dig 0.8 acres in 7 days.
8 people can dig 6/0.8 * 0.8 acres in 6/0.8 * 7 days.
8 people can dig 6 acres in 52.5 days
