45 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?	Select the correct option:
A) 10
B) 13
C) 14
D) 15
E) 16
According to the chain rule,   M1 x T1 = M2 x T2   Therefore, 45 x 12 x 5 = 30 x 6 x X   X = 15   Hence, the number of days = 15.   ANSWER:15
<result>D</result>
45 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?