5
Q:
A) 7 hrs | B) 7.5 hrs |
C) 8 hrs | D) 8.25 hrs |
Answer: B) 7.5 hrs
Explanation:
Explanation:
Let there are L men
job requires LK man hours.
job completed in first 4 hrs = L x 4 = 4L
job completed in next 4 hrs = 4 x L/2 = 2L
job completed in next 4 hrs = 4 x L/4 = L
job completed in last 4 hrs = 4 x L/8 = L/2
4L + 2L + L + L/2 = KL
K = 7+1/2 = 7.5 hours.