(1). An engineer wants to completely build a bridge in 90 days and 120 men were set to work, each working 7 hours a day. After 75 days 5/9 of the work is finished. How many extra men may be employed so that the work may be completed in time, each man now working 10 hours a day?

• (a). 336
• (b). 216
• (c). 126
• (d). 60
• (e). None of these