Problema Solution
bob can mop the floor in 7 minutes. together bob and josh can op the floor in 5 minutes.how long does it take josh to mop the floor alone?
Answer provided by our tutors
let
j = min that Josh needs to mop the floor alone
the rate of Bob is 1/7 floors per min
the rate of Josh is 1/n floors per min
the together rate is 1/5 floors per min
1/7 + 1/j = 1/5
by solving we find
j = 17.5 min
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Josh needs 17.5 min to mop the floor alone.