Sally can paint a room in 8 hours while it takes steve 7 hours to paint the same room. how long would it take them to paint the
room if they worked together?
1 answer:
Rate for Sally is 1 room per 8hrs
rate for Steve is 1 room per 7hrs
combined rate:
1/8 + 1/7 = 1/T
7/56 + 8/56 = 1/T
15/56 = 1/T
56/15 = T
3 11/15 = 3 hrs 44 min
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