If 5 men working for 6 hours a day can reap a field in 20 days, in how many days will 15 men reap the field, working 8 hours a day ?
(a) 5 days
(b) 6 days
(c) 7 & 1/2 days
(d) 9 days
(a) 5 days
(b) 6 days
(c) 7 & 1/2 days
(d) 9 days
