Problem Solving

At a factory, each employee's daily pay ,S, is defined by S=75 + (ny/4) where n is the number of widgets buit by the employee that day and y is the number of years of employment. Abe, Bon and Cindy have 3,6 and 8 years of employment respectively. Each day, Abe works twice as long as Bob and twice as long as Cindy, but Bob builds widgets 50% faster than Abe and 40% slower than Cindy. If Abe, Bob and Cindy's combined daily pay is $675, how many widgets do Abe and Bob build together each day?
A)150
B)160
C)170
D)180
E)190