Wendy begins sanding a kitchen floor by herself and works for 4 hours .She is then joined by Bruce and together 2 of them finish sanding the floor in 2 hours . If bruce can sand the floor himself in 20 hours , how long will it take wendy to sand the floor by herself ?
Considering Bruce's rate to be r . Since she had worked for 4 hours and since Bruce alone can finish it in 20 hours , my equation goes like this -
4(1/r) + 1(1/20) = 1/2 .
Is there a fault with this ? Pls help
Considering Bruce's rate to be r . Since she had worked for 4 hours and since Bruce alone can finish it in 20 hours , my equation goes like this -
4(1/r) + 1(1/20) = 1/2 .
Is there a fault with this ? Pls help
