Mathematics, 03.07.2019 10:30 shaylawaldo11

1) bob can type 2 letters in 4 hours while bill can do it in 6 hours. how many hours would it take them to type six letters together? and 2) my brother is 5 years older than me. my sister is 3 years younger than me. how old will my sister be when my brother is 29? pls me with both

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1) bob can type 2 letters in 4 hours while bill can do it in 6 hours. how many hours would it take t...