Henry completes a piece of work in 640 days, Rose completes the same work in 960 days. If both of them work together, then the number of days required to complete the work is?
Pick:
A) 384
B) 385
C) 386
D) 387
E) 388
If A can complete a work in x days and B can complete the same work in y days, then, both   of them together can complete the work in x y/ x+ y days.   That is, the required No. of days = 640 × 960/1600 = 384 days   384nswer is 384
<result>A</result>
Henry completes a piece of work in 640 days, Rose completes the same work in 960 days. If both of them work together, then the number of days required to complete the work is?